Hartnagel, H. L. ; Sirkeli, V. P. ; Acedo, P. (2021):
THz Spectroscopy by Narrow Spectral Emission of Quantum Cascade Lasers for Medical Applications.
In: 2021 International Semiconductor Conference, pp. 11-18,
IEEE, 44th International Semiconductor Conference (CAS 2021), virtual Conference, 06.-08.10.2021, ISBN 978-1-6654-3571-0,
DOI: 10.1109/CAS52836.2021.9604138,
[Conference or Workshop Item]

Sirkeli, V. P. ; Tiginyanu, I. M. ; Hartnagel, H. L.
Tiginyanu, Ion ; Sontea, Victor ; Railean, Serghei (eds.) (2020):
Recent Progress in GaN-Based Devices for Terahertz Technology.
pp. 231-235, 4th International Conference on Nanotechnologies and Biomedical Engineering, Chisinau, Republic of Moldova, September 18-21, 2019, ISBN 978-3-030-31866-6,
[Conference or Workshop Item]

Hartnagel, H. L. ; Sirkeli, V. P.
Tiginyanu, Ion ; Sontea, Victor ; Railean, Serghei (eds.) (2020):
The Use of Metal Oxide Semiconductors for THz Spectroscopy of Biological Applications.
pp. 213-217, 4th International Conference on Nanotechnologies and Biomedical Engineering, Chisinau, Republic of Moldova, September 18-21, 2019, ISBN 978-3-030-31866-6,
[Conference or Workshop Item]

Sirkeli, V. P. ; Hartnagel, H. L. ; Yilmazoglu, O. ; Preu, S.
Tiginyanu, Ion ; Sontea, Victor ; Railean, Serghei (eds.) (2020):
ZnO-Based Quantum Structures for Terahertz Sources.
pp. 219-223, 4th International Conference on Nanotechnologies and Biomedical Engineering, Chisinau, Republic of Moldova, September 18-21, 2019, ISBN 978-3-030-31866-6,
[Conference or Workshop Item]

Sirkeli, V. P. ; Hartnagel, H. L. (2019):
ZnO-based terahertz quantum cascade lasers.
In: Opto-Electronics Review, 27 (2), pp. 119 - 122. ISSN 1230-3402,
DOI: 10.1016/j.opelre.2019.04.002,
[Article]

Sirkeli, V. P. ; Yilmazoglu, O. ; Küppers, F. ; Hartnagel, H. L. (2018):
2.08 THz and 4.96 THz Room-Temperature Quantum Cascade Lasers Based on Non-Polar M-Plane ZnMgO/ZnO.
pp. 1-2, 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), ISSN 2162-2035,
DOI: 10.1109/IRMMW-THz.2018.8510344,
[Conference or Workshop Item]

Küppers, F. ; Sirkeli, V. P. ; Yilmazoglu, O. ; Hajo, A. S. ; Nedeoglo, N. D. ; Nedeoglo, D. D. ; Preu, S. ; Hartnagel, H. L. (2018):
High-performance near-ultraviolet ZnSe-based photodetectors with Cr/Au and Ni/Au contacts.
9th MSCMP Conference Moldova, Chisinau, Republic of Moldova, 25–28 September 2018, [Conference or Workshop Item]

Hartnagel, H. L. ; Sirkeli, V. P. ; Yilmazoglu, O. ; Hajo, A. S. ; Nedeoglo, N. D. ; Nedeoglo, D. D. ; Preu, S. ; Küppers, F. (2018):
Near-ultraviolet avalanche photodetectors based on bulk ZnSe.
40th WOCSDICE Conference, Bucharest, Romania, [Conference or Workshop Item]

Yilmazoglu, O. ; Al-Daffaie, S. ; Küppers, F. ; Hartnagel, H. L. (2016):
New photocathodes for THz vacuum microelectronic devices.
Energy, Materials, Nanotechnology (EMN) Meeting on Vacuum Electronics, Las Vegas, NV, USA, November 2016, [Conference or Workshop Item]

Sirkeli, V. P. ; Yilmazoglu, O. ; Al-Daffaie, S. ; Oprea, I. ; Ong, D. S. ; Kueppers, F. ; Hartnagel, H. L. (2016):
Effect of Si-Doping of the GaN Barrier on the Internal Quantum Efficiency of InGaN/GaN Light-Emitting Diodes.
8th International Conference on Materials Science and Condensed Matter Physics / MSCMP-2016, Chisinau, Moldova, September 2016, [Conference or Workshop Item]

Yilmazoglu, O. ; Al-Daffaie, S. ; Küppers, F. ; Hartnagel, H. L. (2015):
New photocathodes for THz vacuum microelectronic devices.
Energy, Materials, Nanotechnology (EMN) Meeting on Vacuum Electronics, Las Vegas, NV USA, [Conference or Workshop Item]

Sirkeli, V. P. ; Yilmazoglu, O. ; Küppers, F. ; Hartnagel, H. L. (2015):
Enhanced efficiency of p-GaN/n-ZnO light-emitting diodes by using NiO and ZnSe interlayers.
3rd International Conference on Nanotechnologies and Biomedical Engineering ICNBME, Chisinau, Republic of Moldova, [Conference or Workshop Item]

Hartnagel, H. L.
Sontea, Victor ; Tiginyanu, Ion (eds.) (2015):
Plasmonic Effects for Enhanced Optical Mixing in View of THz Signal Generation.
In: 3rd International Conference on Nanotechnologies and Biomedical Engineering: ICNBME-2015, September 23-26, 2015, Chisinau, Republic of Moldova, pp. 186-187,
Springer Singapore, 3rd International Conference on Nanotechnologies and Biomedical Engineering: ICNBME-2015, Chisinau, Republic of Moldova, ISBN 978-981-287-736-9,
[Conference or Workshop Item]

Yilmazoglu, O. ; Al-Daffaie, S. ; Küppers, F. ; Hartnagel, H. L. ; Neo, Y. ; Mimura, H. (2015):
Ultrafast photocathodes based on n-doped graphene emitters on compound semiconductor photoswitches.
pp. 180-181, 28th International Vacuum Nanoelectronics Conference (IVNC), [Conference or Workshop Item]

Hartnagel, H. L. ; Al-Daffaie, S. ; Yilmazoglu, O. (2015):
Plasmonics and Graphene for THz Generation by Optical Mixing.
The 4th Russia-Japan-USA Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies, At IMT, ISSP, Chernogolovka, Russia, ISSN 1648-8504,
[Conference or Workshop Item]

Al-Daffaie, S. ; Yilmazoglu, O. ; Küppers, F. ; Hartnagel, H. L. (2015):
1-D and 2-D Nanocontacts for Reliable and Efficient Terahertz Photomixers.
In: IEEE Transactions on Terahertz Science and Technology, 5 (3), pp. 398-405. ISSN 2156-342X,
[Article]

Hartnagel, H. L. ; Al-Daffaie, S. ; Yilmazoglu, O. (2015):
Plasmonics in semiconductors and in Ag submicron wires and graphene.
In: Lithuanian Journal of Physics, 55 (4), pp. 287-291. [Article]

Hartnagel, H. L. ; Al-Daffaie, S. ; Yilmazoglu, O. (2015):
Plasmonics in semiconductors and in Ag submicron wires and graphene.
In: Lithuanian Journal of Physics, 55 (4), [Article]

Yilmazoglu, O. ; Al-Daffaie, S. ; Küppers, F. ; Hartnagel, H. L. ; Neo, Y. ; Mimura, H. (2014):
Photocathodes based on graphene nanoplatelet emitters on semi-insulating GaAs photoswitch.
pp. 21-22, Vacuum Nanoelectronics Conference (IVNC), 2014 27th International, [Conference or Workshop Item]

Halbritter, H. ; Sydlo, C. ; Koegel, B. ; Riemenschneider, F. ; Hartnagel, H. L. ; Meissner, Peter (2006):
Linewidth and chirp of MEMS-VCSELs.
In: IEEE Photonics Technology Letters, 18, pp. 2180-2182. [Article]

Handel, P. H. ; Tournier, A. G. ; Hartnagel, H. L. ; Mishra, U. K. ; York, R. (2005):
1/f Noise in GaN/AlGaN HFET Based Amplifiers.
In: Proceedings WOCSDICE : Workshop on Compound Semiconductor Devices and Integrated Circuits in Europe <29, 2005, Cardiff, UK>, S. 101-103, [Conference or Workshop Item]

Sydlo, Cezary ; Mendis, R. ; Sigmund, J. ; Feiginov, Michael N. ; Hartnagel, H. L. ; Meissner, P. (2005):
Binary optical mixing for broadband THz communication.
In: Proceedings 2005 IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics : Hilton Hawaiian Village, Honolulu, Hawaii, April 3 - 7, 2005. - Piscataway, NJ : IEEE Operations Center, 2005 ISBN: 0-7803-9068-7, Piscataway, NJ, IEEE Operations Center, [Conference or Workshop Item]

Vicente, C. ; Mattes, M. ; Wolk, D. ; Hartnagel, H. L. ; Mosig, J. R. ; Raboso, D. (2005):
FEST3D : a simulation tool for corona prediction.
In: Proceedings of the International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM, 5.2005), ESTEC, Noordwijk, The Netherlande, 12-14. September 2005, S. 227-233, [Conference or Workshop Item]

Vicente, C. ; Mattes, M. ; Wolk, D. ; Hartnagel, H. L. (2005):
FEST3D : a simulation tool for multipactor prediction.
In: Proceedings of the International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM 2005), ESTEC, Noordwijk, The Netherlande, 12-14. September 2005, pp 11-17, [Conference or Workshop Item]

Litovchenko, V. ; Evtukh, A. ; Yilmazoglu, O. ; Mutamba, K. ; Hartnagel, H. L. ; Pavlidis, D. (2005):
Gunn effect in field-emission phenomena.
In: Journal of Applied Physics, 97, pp. 044911-1. [Article]

Vicente, C. ; Wolk, D. ; Hartnagel, H. L. ; Raboso, D. (2005):
An Investigation on Passive Intermodulation Generation at Waveguide Junctions.
In: Proceedings of the International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM 5. 2005), ESTEC, Noordwijk, The Netherlande, 12-14. September 2005, S. 207-214, [Conference or Workshop Item]

Dragoman, M. ; Hartnagel, H. L. ; Tuovinen, J. ; Plana, R. (2005):
Microwave applications of carbon nanotubes.
In: Frequenz, 59, pp. 251-263. [Article]

Sigmund, J. ; Sydlo, C. ; Hartnagel, H. L. ; Teissmann, R. ; Benker, N. ; Fuess, Hartmut ; Rutz, F. ; Koch, M. (2005):
Non-stoichiometric growth and precipitation formation in LTG-GaAsSb for THzapplications.
In: Papers from the 23rd North American Conference on Molecular Beam Epitaxy : [held at the University of California at Santa Barbara from 11 - 14 September 2005] / [Gerry Sullivan, proceedings ed.]. - New York, NY : American Inst. of Physics, 2006; S. 153, New York, NY, American Inst. of Physics, [Conference or Workshop Item]

Vicente, C. ; Hartnagel, H. L. (2005):
Passive-intermodulation analysis between rough rectangular waveguide flanges.
In: IEEE Transactions on Microwave Theory and Techniques, 53, pp. 2515-2525. [Article]

Sydlo, C. ; Sigmund, J. ; Hartnagel, H. L. ; Mendis, R. ; Feiginov, Michael N. ; Meissner, P. (2005):
Planar Terahertz antenna optimisation.
In: Proceeding 2005 IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics : Hilton Hawaiian Village, Honolulu, Hawaii, April 3 - 7, 2005. - Piscataway, NJ : IEEE Operations Center, 2005 ISBN 0-7803-9068-7, Piscataway, NJ, IEEE Operations Center, [Conference or Workshop Item]

Hartnagel, H. L. (2005):
Proposal for fine-tuning of current across MEMS device by quantum- electronic structure.
In: Frequenz, 59, pp. 206-207. [Article]

Mendis, R. ; Sydlo, C. ; Sigmund, J. ; Feiginov, Michael N. ; Meissner, P. ; Hartnagel, H. L. (2005):
Spectral characterization of broadband THz antennas by photoconductive mixing : towards optimal antenna design.
In: IEEE Antennas and Wireless Propagation Letters, 4, pp. 85-88. [Article]

Hartnagel, H. L. (2005):
The introduction of quantum electronic structures for MEMS devices.
In: Lithunian Journal of Physics, 45, [Article]

Wolk, D. ; Vicente, C. ; Hartnagel, H. L. ; Mattes, M. ; Mosig, J. R. ; Raboso, D. (2005):
An investigation on the effect of fringing fields on multipactor breakdown.
In: Proceedings of the International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM 5. 2005), ESTEC, Noordwijk, The Netherlande, 12-14.September 2005, S 93-99 [129] C. Vicente, M. Mattes, D. Wolk, H.L. Hartnagel, J., [Conference or Workshop Item]

Chowdhury, D. Roy ; Saglam, M. ; Mutamba, K. ; Hartnagel, H. L. (2005):
A novel way to reduce conduction current in Al0:7Ga0:3As/GaAs heterostructure Barier Varactors.
In: Proceedings of the XIII International Workshop on Physics of Semiconductor Devices (IWPSD-2005) : December 13 - 17, 2005 / National Physical Laboratory, New Delhi. Ed.: Vikram Kumar ... Vol. 2, S. 817-821 ISBN: 81-7764947-7, [Conference or Workshop Item]

Yilmazoglu, Oktay ; Brandt, M. ; Sigmund, J. ; Genc, E. ; Hartnagel, H. L. (2001):
Integrated InAs/GaSb 3D magnetic field sensors for "the intelligent tire".
In: Sensors and Actuators A : Physical, 94 (1-2), pp. 59-63. Elsevier, ISSN 0924-4247,
DOI: 10.1016/S0924-4247(01)00700-2,
[Article]

Sigmund, Jochen ; Saglam, M. ; Vogt, Alexander ; Hartnagel, H. L. ; Buschmann, V. ; Wieder, Thomas ; Fuess, H. (2001):
Microstructure analysis of ohmic contacts on MBE grown n-GaSb and investigation of submicron contacts.
In: Journal of Crystal Growth, 227-228, pp. 625-629. Elsevier, ISSN 0022-0248,
DOI: 10.1016/S0022-0248(01)00785-0,
[Article]

Saglam, Mustafa ; Bozzi, M. ; Megej, A. ; Rodriguez-Girones, M. ; Perregrini, L. ; Hartnagel, H. L. (2001):
Characterization of heterostructure-barrier-varactors for frequency multiplication.
In: International journal of infrared and millimeter waves, 22, [Article]

Ichizli, Victoria M. ; Droba, M. ; Mutamba, K. ; Sigurdardottir, A. ; Hartnagel, H. L. (2001):
Comparative investigation of interface effect on transmission function of electrons and holes in InAs/AlSb-based heterostructures.
In: PCSI-28: International Conference on Physics and Chemistry of Semiconductor Interfaces <28, 2001, Orlando, Florida>; Proceedings, [Conference or Workshop Item]

Megej, Alexander ; Beilenhoff, K. ; Hartnagel, H. L. (2001):
Conditions for broadband MMIC voltage-controlled oscillators based on theory and experiments.
In: IEEE-MTT-S International Microwave Sympsoium Digest, 3, pp. 1419-1422. [Article]

Stevens-Kalceff, M. A. ; Tiginyanu, I. M. ; Langa, S. ; Föll, H. ; Hartnagel, H. L. (2001):
Correlation between morphology and cathodoluminescence in porous GaP.
In: Journal of applied physics, 89, [Article]

Sydlo, Cezary ; Mottet, B. ; Ganis, H. ; Hartnagel, H. L. ; Krozer, V. ; Delage, S. L. ; Cassette, S. ; Chartier, E. ; Floriot, D. (2001):
Defect detection and modelling using pulsed electrical stress for reliability investigations of InGaP HBT.
In: ESREF 2001: European Symposium on Reliability of Electron Devices <12, 2001, Arcachon>: Conference proceedings. Vol. 1, S. 1567-1571. - Oxford : Pergamon, 2001, Oxford, Pergamon, [Conference or Workshop Item]

Yilmazoglu, Oktay ; Mimura, H. ; Mutamba, K. ; Hartnagel, H. L. ; Shimawaki, H. ; Yokoo, K. (2001):
Emission behaviour of micromachined vertical field emitter with cantilever structure.
In: European Field Emission Workshop <3, 2001, Alicante>: Proceedings, [Conference or Workshop Item]

Ichizli, Victoria M. ; Hartnagel, H. L. ; Mimura, H. ; Shimawaki, H. ; Yokoo, K. (2001):
Field emission from porous (100) GaP with modified morphology.
In: Applied physics letters, 79, [Article]

Saura, A. ; Monecke, J. ; Irmer, G. ; Tiginyanu, I. M. ; Gärtner, G. ; Hartnagel, H. L. (2001):
Fröhlich modes in porous III-V semiconductors.
In: Journal of physics, pp. 6687-6706. [Article]

Megej, Alexander ; Beilenhoff, K. ; Sydlo, C. ; Hartnagel, H. L. (2001):
Fully monolithically integrated wide-band RF-source.
In: EuMC 2001: European Microwave Conference <31, 2001, London>; Proceedings. Vol. 3, S. 125-128, [Conference or Workshop Item]

Yilmazoglu, Oktay ; Mimura, H. ; Mutamba, K. ; Hartnagel, H. L. ; Okamura, K. ; Shimawaki, H. ; Yokoo, K. (2001):
Generation of a bunched beam by field-emitter structures.
In: Displays and Vacuum Electronics <2001, Garmisch-Partenkirchen>: Proceedings. S. 263-267. - Berlin: VDE-Verl., 2001, Berlin, VDE-Verl., [Conference or Workshop Item]

Yilmazoglu, Oktay ; Mimura, H. ; Mutamba, K. ; Cojocari, O. ; Hartnagel, H. L. ; Okamura, K. ; Shimawaki, H. ; Yokoo, K. (2001):
Generation of modulation beam with GaAs field-emitter structures.
In: IVEC 2001: International Vacuum Electronics Conference <2, 2001, Noordwijk>: Proceedings, [Conference or Workshop Item]

Mutamba, Kabula ; Beilenhoff, K. ; Megej, A. ; Woelk, C. ; Hartnagel, H. L. (2001):
Micromachined GaAs sensors for microwave and millimeter-wave power measurement.
In: mstnews, pp. S. 42-43. [Article]

Megej, Alexander ; Hartnagel, H. L. (2001):
Microwave source studies based on reflection-type oscillators and different HEMT-circuit configurations.
In: WOCSDICE 2001: Workshop on Compound Semiconductor Devices & Integrated Circuits <25, 2001, Cagliary>; Proceedings. S. 59-60, [Conference or Workshop Item]

Gottwald, P. ; Kräutle, H. ; Szentpali, B. ; Hartnagel, H. L. (2001):
Results on passivation of InP by photo-CVD SiO2 and SiNx obtained by using the low-frequency noise measurement technique.
In: Fluctuation and noise letters, 1, pp. S. L35-L43. [Article]

Ichizli, Victoria M. ; Rodriguez-Girones, M. ; Lin, Ch.-I. ; Szeliga, P. ; Hartnagel, H. L. (2001):
The effect of glas plasma on the deposition quality of Schottky metals and interconnect metallisation for planar diodes structure for THz applications.
In: International Conference on THz Electronics <9, 2001, Charlottesville, Virginia>: Proceedings, [Conference or Workshop Item]

Schuessler, M. ; Mottet, B. ; Sydlo, C. ; Krozer, V. ; Hartnagel, H. L. ; Jakoby, Rolf (2000):
Model for the Decrease in HBT Collector Current under DC Stress based on Recombination Enhanced Defect Reactions.
Dresden, Germany, 11th ESREF-Symposium, [Conference or Workshop Item]

Tiginyanu, I. M. ; Kravetsky, I. V. ; Marowsky, G. ; Monecke, J. ; Hartnagel, H. L. (2000):
Design of new nonlinear optical materials based on porous III-V compounds.
In: physica status solidi (b), 221 (1), pp. 557-560. WILEY-VCH, ISSN 0370-1972, e-ISSN 1521-3951,
DOI: 10.1002/1521-3951(200009)221:1<557::AID-PSSB557>3.0.CO;2-6,
[Article]

Ichizli, Victoria M. ; Riemenschneider, R. ; Hartnagel, H. L. (2000):
Scanning tunneling spectroscopy characterisation of As+ implanted InP (100) single crystals.
In: Journal of Vacuum Science and Technology B, 18 (5), AIP Publishing, ISSN 2166-2746,
DOI: 10.1116/1.1288202,
[Article]

Ichizli, Victoria M. ; Mutamba, K. ; Droba, M. ; Sigurdardottir, A. ; Hartnagel, H. L. (2000):
Interface tuning of the InAs/AlSb heterostructure-based quantum wells.
In: Journal of Vacuum Science and Technology B, 18 (4), pp. 2279-2283. AIP Publishing, ISSN 2166-2746,
DOI: 10.1116/1.1303810,
[Article]

Droba, Martin ; Beilenhoff, K. ; Hartnagel, H. L. ; Ratzinger, U. (2000):
180 degree bending systems for higher current heavy ion linacs.
In: EPAC 2000: European Particle Accelerator Conference <2000, Wien>: Proceedings. S. 1483-1485, [Conference or Workshop Item]

Saglam, Mustafa ; Bozzi, M. ; Domoto, C. ; Rodriguez-Girones, M. ; Perregrini, L. ; Hartnagel, H. L. (2000):
Al07Ga03As/GaAs HBV for 255 GHz tripling operation.
In: Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe <24, 2000, Aegean Sea, Greece>: Proceedings, [Conference or Workshop Item]

Saglam, Mustafa ; Bozzi, M. ; Domoto, C. ; Megej, A. ; Rodriguez-Girones, M. ; Perregrini, L. ; Hartnagel, H. L. (2000):
AlGaAs HBV performance in frequency tripling at 255 GHz.
In: GAAS 2000: Gallium Arsenide and other Semiconductor Application Symposium <2000, La Defense, Paris>: Proceedings, [Conference or Workshop Item]

Saglam, Mustafa ; Bozzi, M. ; Rodriguez-Girones, M. ; Lin, C.-I. ; Megej, A. ; Perregrini, L. ; Hartnagel, H. L. (2000):
Characterization of heterostructure barrier varactors for 255 GHz tripling operation.
In: International Conference on Infrared and Millimeter Waves <25, 2000, Beijing, China>: Proceedings, [Conference or Workshop Item]

Lal, K. ; Hartnagel, H. L. ; Goswami, N. ; Thoma, P. (2000):
Experimental evaluation of on-chip measurement of charge transfer by X-rays.
In: Electronics letters, 36, [Article]

Megej, Alexander ; Beilenhoff, K. ; Hartnagel, H. L. (2000):
Fully integrated PHEMT voltage controlled oscillator with very high tuning bandwidth.
In: Conference Proceedings: EuMC: European Microwave Week - [incorporating the] 30th European Microwave Conference 2000, GAAS 2000: Gallium Arsenide and other Semiconductor Application Symposium <2000, La Defense, Paris>. S. 428-431, [Conference or Workshop Item]

Megej, Alexander ; Beilenhoff, K. ; Hartnagel, H. L. (2000):
Fully monolithically integrated feedback voltage controlled oscillator.
In: IEEE Microwave and guided wave letters, 10, [Article]

Yilmazoglu, Oktay ; Hartnagel, H. L. ; Mimura, H. ; Okumura, K. ; Shimawaki, H. ; Yokoo, K. (2000):
Gunn effect based modulationbeam generation with GaAs lateral field emitter structures.
In: European Field Emission Workshop <2, 2000, Segovia>: Proceedings, [Conference or Workshop Item]

Manca, J. ; Croes, K. ; De Ceuninck, W. ; De Schepper, L. ; Dieval, B. ; Hartnagel, H. L.
Papanicolaou, Nick Naval Research Laboratory (eds.) (2000):
High temperature time dependent dielectric breakdown of power MOSFETs.
In: Reliabiblity, lifetime and testing : session V, pp. o. A., [Book Section]

Mutamba, Kabula ; Pfeiffer, J. ; Beilenhoff, K. ; Peerlings, J. ; Megej, A. ; Meissner, P. ; Hartnagel, H. L. (2000):
III-V compound MEMS solutions for sensors and optical communications.
In: Symposium on Microsystem Technology <2000, National Cheng Kung Univ., Taiwan>: Proceedings. S. 163-169, [Conference or Workshop Item]

Miranda-Pantoja, J. M. ; Lin, C.-I. ; Brandt, M. ; Rodriguez-Girones, M. ; Hartnagel, H. L. ; Sebastian, J. L. (2000):
Influence of reactive ion etching on the microwave trap noise generated in Pt/n-GaAs Schottky diode interfaces.
In: IEEE Electron device letters, 21, [Article]

Sigmund, Jochen ; Saglam, M. ; Vogt, Alexander ; Hartnagel, H. L. ; Buschmann, V. ; Wieder, Thomas ; Fuess, H. (2000):
Microstructure analysis of Ohmic contacts on MBE grown n-GaSb layers and investigation of submicron contacts.
In: MBE-XI: International Conference on Molecular Beam Epitaxy <11, 2000, Beijing, China>: Abstract Book.S. 275, [Conference or Workshop Item]

Schuessler, M. ; Mottet, B. ; Sydlo, C. ; Krozer, V. ; Hartnagel, H. L. ; Jakoby, Rolf (2000):
Model for the decrease in HBT collector current under DC stress based on recombination enhanced defect reactions.
In: ESREF 2000: European Symposium on Reliability of Electron Devices, Failure Physics and Analysis <11, 2000, Dresden>: Proceedings. S. 1733-1738. - Oxford: Pergamon, 2000, Oxford, Pergamon, [Conference or Workshop Item]

Miranda-Pantoja, J. M. ; Lin, C.-I. ; Shalaan, M. ; Sebastian, J. L. ; Munoz, S. ; Hartnagel, H. L. (2000):
Monte Carlo simulation of microwave noise temperature in cooled GaAs and InP.
In: IEEE Transactions on microwave theory and techniques, 48, pp. S. 1275-1279. [Article]

Schwab, C. ; Tiginyanu, I. M. ; Sarua, A. ; Irmer, G. ; Monecke, J. ; Sigmund, J. ; Hartnagel, H. L. (2000):
Nanoporous membranes and heterostructures based on III-V compounds.
In: NATO Advanced Research Workshop on Frontiers of Nano-Optoelectronic Systems: Molecular Scale Engineering and Processes <2000, Kiev>: Proceedings. - Dordrecht (u.a.): Kluwer Acad. Publ., 2000, Dordrecht (u.a.), Kluwer Acad. Publ., [Conference or Workshop Item]

Tiginyanu, I. ; Langa, S. ; Hjort, K. ; Monecke, J. ; Hartnagel, H. L. (2000):
Nanotexturization of III-V compounds for THz-wave generation.
In: THz Conference 2000: 8th International Conference on Terahertz Electronics, 2000 Darmstadt Techn. Univ., Inst. für Hochfrequenztechnik. - Berlin (u.a.): VDE-Verl., 2000. Abstract Booklet, S. 275, Berlin (u.a.), VDE-Verl., [Conference or Workshop Item]

Tiginyanu, I. ; Kravetsky, I. ; Pavlidis, D. ; Eisenbach, A. ; Hildebrandt, R. ; Marowsky, G. ; Hartnagel, H. L. (2000):
Nonlinear optical characterization of GaN layers grown by MOCVD on sapphire.
In: MRS Internet journal nitride semiconductor research. 5S1, W11.52 (2000), [Article]

Kravetsky, V. ; Tiginyanu, I. M. ; Hildebrandt, R. ; Marowsky, G. ; Pavlidis, D. ; Eisenbach, A. ; Hartnagel, H. L. (2000):
Nonlinear optical response of GaN layers on sapphire: the impact of fundamental beam interference.
In: Applied physics letters, 76, pp. S. 810-812. [Article]

Tiginyanu, I. ; Schwab, C. ; Sarua, A. ; Irmer, G. ; Monecke, J. ; Sigmund, J. ; Hartnagel, H. L. (2000):
Optical characteristics of nanostructured III-V compounds.
In: NATO Advanced Research Workshop on Frontiers of Nano-Optoelectronic Systems: Molecular Scale Engineering and Processes <2000, Kiev>: Proceedings. - Dordrecht (u.a.): Kluwer Acad. Publ., 2000, Dordrecht (u.a.), Kluwer Acad. Publ., [Conference or Workshop Item]

Monecke, J. ; Irmer, G. ; Sarua, A. ; Tiginyanu, I. M. ; Gartner, G. ; Hartnagel, H. L. (2000):
Optische Phononen und elektrische Eigenschaften poröser GaP-Membranen.
In: Frühjahrstagung der Deutschen Physikalischen Gesellschaft <2000, Regensburg> = Verhandlungen der Deutschen Physikalischen Gesellschaft; 35,4, [Conference or Workshop Item]

Sarua, A. ; Gärtner, G. ; Irmer, G. ; Monecke, J. ; Tiginyanu, I. M. ; Hartnagel, H. L. (2000):
Raman and IR-reflectance spectra of porous III-V semiconductor structures.
In: Physica Status Solidi A, 182, pp. S. 207-211. Wiley-VCH, ISSN 1862-6300,
[Article]

Sarua, A. ; Irmer, G. ; Monecke, J. ; Tiginyanu, I. M. ; Schwab, C. ; Grob, J.-J. ; Hartnagel, H. L. (2000):
Raman spectroscopy of porous and bulk GaP subjected to MeV-ion implantation and annealing.
In: Journal of applied physics, 88, pp. S. 7006-7012. [Article]

Tiginyanu, I. ; Kravetsky, I. V. ; Monecke, J. ; Cordts, W. ; Marowsky, G. ; Hartnagel, H. L. (2000):
Semiconductor sieves as nonlinear optical materials.
In: Applied physics letters, 77, pp. S. 2415-2417. [Article]

Tiginyanu, I. ; Kravetsky, I. V. ; Marowsky, G. ; Monecke, J. ; Cordts, W. ; Hartnagel, H. L. (2000):
Semiconductor sieves as novel materials for nonlinear optical applications.
In: Materials Research Society: Fall Meeting <2000, Boston, Mass.>. Abstract Booklet; Report ES.13, [Conference or Workshop Item]

Akar, I. ; Mutamba, K. ; Euterneck, C. ; Aarab, H. ; Coulibaly, S. ; Brecht, S. ; Hartnagel, H. L. (2000):
Technology of integrated application specific GaAs flow sensors.
In: HETECH 2000: European Workshop Heterostructure Technology <10, 2000, Ulm>: Proceedings, [Conference or Workshop Item]

Sigmund, Jochen ; Saglam, M. ; Cojocari, O. ; Tiginyanu, I. ; Hartnagel, H. L. (2000):
Untersuchungen von epitaktischem Überwachsen auf porösen GaP und n-GaAs Substraten.
In: Epitaxie von III/V-Halbleitern: 15. Workshop des DGKK-Arbeitskreises , 2000 Bad Dürkheim. Tagungsbd., [Conference or Workshop Item]

Sydlo, Cezary ; Mottet, B. ; Schuessler, M. ; Brandt, M. ; Hartnagel, H. L. (2000):
A method for HBT process control and defect detection using pulsed electrical stress.
In: ESREF 2000: European Symposium on Reliability of Electron Devices, Failure Physics and Analysis <11, 2000, Dresden>: Proceedings. S. 1449-1453. - Oxford: Pergamon, 2000, Oxford, Pergamon, [Conference or Workshop Item]

Bozzi, M. ; Saglam, M. ; Rodriguez-Girones, M. ; Perregrini, L. ; Hartnagel, H. L. (2000):
A new evolutionary approach for the analysis and optimization of THz nonlinear circuits.
In: International Conference on Terahertz Electronics <8, 2000, Darmstadt>. - Berlin, Offenbach: VDE-Verl., 2000, Berlin, Offenbach, VDE-Verl., [Conference or Workshop Item]

Sarua, A. ; Tiginyanu, I. M. ; Ursaki, V. V. ; Irmer, G. ; Monecke, K. ; Hartnagel, H. L. (1999):
Charge carrier distribution in free-standing porous GaP membranes studied by Raman spectroscopy.
In: Solid State Communications, 112 (10), pp. 581-585. Elsevier ScienceDirect, ISSN 00381098,
DOI: 10.1016/S0038-1098(99)00385-3,
[Article]

Miranda-Pantoja, J. M. ; Lin, C. I. ; Shalaan, M. ; Hartnagel, H. L. ; Sebastian, J. L. (1999):
Influence of the minimization of self-scattering events on the Monte Carlo simulation of carrier transport in III-V semiconductors.
In: Semiconductor science and technology, 14 (9), pp. 804-808. IOP Publishing Ltd., ISSN 02681242,
DOI: 10.1088/0268-1242/14/9/310,
[Article]

Ichizli, Victoria M. ; Vogt, Alexander ; Sigurdardottir, A. ; Tiginyanu, I. M. ; Hartnagel, H. L. (1999):
Tunneling spectroscopy of AlAs and InSb interfaces in InAs/AlSb heterostructures.
In: Semiconductor science and technology, 14 (2), pp. 143-147. IOP Publishing Ltd., ISSN 02681242,
DOI: 10.1088/0268-1242/14/2/007,
[Article]

Hillenbrand, Joachim ; Angert, N. ; Hartnagel, H. L. ; Neumann, R. (1999):
Depolarization RADII of latent heavy-ion tracks in poly(vinylidene fluoride).
Darmstadt, Gesellschaft für Schwerionenforschung, GSI Preprint 1999-07, [Report]

Mier, A. ; Pascual, J. P. ; Beilenhoff, K. ; Rheinfelder, C. ; Luy, J. F. ; Hartnagel, H. L. (1999):
Design of a 38 GHz small signal amplifier for a coplanar Si/SiGe MMIC technology process.
In: Workshop on CAD and Verification of Millimeter-Wave and Submillimeter-Wave Circuits <1999, München>: Workshop Proceedings, [Conference or Workshop Item]

Berberich, Stephan ; Godignon, P. ; Millan, J. ; Planson, D. ; Hartnagel, H. L. ; Senses, A. (1999):
Electrical characterisation of MNOS devices on p-type 6H-SiC.
In: Diamond and related materials, 8, pp. 305-308. [Article]

Berberich, Stephan ; Godignon, P. ; Morvan, E. ; Fonseca, L. ; Millan, J. ; Hartnagel, H. L. (1999):
Electrical characterisation of Si3N4/SiO2 double layers on p-type 6H-SiC.
In: Workshop on Dielectrics <10, 1999, Barcelona>: Proceedings, [Conference or Workshop Item]

Facsko, S. ; Dekorsy, T. ; Trappe, C. ; Kurz, H. ; Vogt, Alexander ; Hartnagel, H. L. (1999):
Formation of ordered nanoscale semiconductor dots by ion sputtering.
In: American Association for Advance of Science, 285, pp. 1551-1553. [Article]

Micheel, Lutz ; Sigurdardottir, A. ; Hartnagel, H. L. ; Mutamba, K. (1999):
GaAs- and InP-based technologies of resonant tunneling devices.
In: International Workshop on Post-Binary Ultra-Large-Scale Integration systems <8, 1999, Freiburg im Breisgau>: Proceedings, [Conference or Workshop Item]

Lin, Chih-I. ; Vogt, Alexander ; Saglam, M. ; Hartnagel, H. L. (1999):
GaAs-Schottkydioden mit InAs-Elektrode.
In: MBE: Molecular Beam Epitaxy Workshop <1999, Würzburg>; Proceedings, [Conference or Workshop Item]

Lal, K. ; Goswami, N. ; Miao, J. ; Hartnagel, H. L. (1999):
High-resolution X-ray diffraction study of free-standing gallium arsenide coiled membrane force sensors produced by micromachining.
In: Indo-Russian Workshop on Micromechanical Systems = SPIE Proceedings. Vol. 3903 (1999), [Conference or Workshop Item]

Matulionis, A. ; Aninkevicius, V. ; Liberis, J. ; Matulioniene, I. ; Berntgen, J. ; Heime, K. ; Hartnagel, H. L. (1999):
Hot-electron energy relaxation , noise, and lattice strain in InGaAs quantum well channels.
In: Applied physics letters, 74, [Article]

Beilenhoff, Klaus ; Mutamba, K. ; Simon, A. ; Hartnagel, H. L. (1999):
III-V Semiconductor structuring for mm and sub-mm waves.
In: Workshop on Micromachined Microwave and Millimeter-Wave Antennas and Circuits <1999, München>: Workshop Proceedings, [Conference or Workshop Item]

Wischmeyer, Frank ; Niemann, E. ; Hartnagel, H. L. (1999):
Improvements of the SiC homoepitaxy process in a horizont cold-wall CVD reactor.
In: Journal of electronic materials, 28, pp. 173-177. [Article]

Pfeiffer, Joachim ; Riemenschneider, R. ; Mutamba, K. ; Peerlings, J. ; Afshar, B. E. ; Baaser, Herbert ; Grunert, D. ; Meissner, P. ; Hartnagel, H. L. (1999):
Indium phosphide based bulked micromachining technology for micromechanically tunable WDM filter applications.
In: TRANSDUCERS'99 <1999, Sendai, Japan>: Proceedings. S. 380-383, [Conference or Workshop Item]

Mutamba, Kabula ; Sigurdardottir, A. ; Vogt, Alexander ; Pfeiffer, J. ; Behner, U. ; Di Carlo, A. ; Hartnagel, H. L. (1999):
Micromachined pressure sensors with AlGaAs/GaAs- and InAs/AlSb/GaSb-resonant tunneling diodes.
In: Annual Device Research Conference <57, 1999, Santa Barbara, Calif.>: Digest, [Conference or Workshop Item]

Hillenbrand, Joachim ; Angert, N. ; Hartnagel, H. L. ; Neumann, R. (1999):
NIM B beam interactions with materials and atoms.
In: Nuclear instruments and methods in physics research B, 151, [Article]

Sigurdardottir, Anna ; Megej, A. ; Beilenhoff, K. ; Hartnagel, H. L. (1999):
Oscillator circuit-simulations using a novel, mathematically robust large-signal equivalent model for DBRTD.
In: EUMC'99: European Microwave Conference <29, 1999, München>; Proceedings. S. 270-273, [Conference or Workshop Item]

Micheel, Lutz ; Sigurdardottir, A. ; Hartnagel, H. L. ; Mutamba, K. (1999):
Programmable HBT-Quantum dot structures for arithmetic MVL.
In: International Workshop on Post-Binary Ultra-Large-Scale Integration Systems <8, 1999, Freiburg im Breisgau>: Proceedings,, [Conference or Workshop Item]

Tiginyanu, I. ; Ursaki, V. V. ; Raptis, Y. S. ; Stergiou, V. ; Anatassakis, E. ; Hartnagel, H. L. ; Vogt, Alexander ; Prevot, B. ; Schwab, C. (1999):
Raman modes in porous GaP under hydrostatic pressure.
In: Physica status solidi, 211, pp. 281-286. Wiley & Sons Ltd., [Article]

Lal, K. ; Goswami, N. ; Miao, J. ; Hartnagel, H. L. (1999):
Structural characterization of free-standing gallium arsenide coiled membranes produced by micromachining.
In: Journal of applied crystallography, 32, [Article]

Shaalan, Mohamed ; Beilenhoff, K. ; Bozzi, M. ; Arcioni, P. ; Conciauro, G. ; Hartnagel, H. L. (1999):
Technology and results of quasi-optical multipliers.
In: Workshop on CAD and Verification of Millimeter-Wave and Submillimeter-Wave Circuits <1999, München>: Workshop Proceedings, [Conference or Workshop Item]

Arcioni, P. ; Bozzi, M. ; Conciauro, G. ; Perregrini, L. ; Hartnagel, H. L. ; Shalaan, M. (1999):
An efficient algorithm for the analysis and optimization of quasi-optical frequency multipliers.
In: Atti della Fondazione Giorgio Ronchi, 54 (3-4), pp. 367-373. Giorgio Ronchi Foundation, ISSN 03912051,
[Article]

Dehe, A. ; Beilenhoff, K. ; Fricke, A. ; Klingbeil, Harald ; Krozer, V. ; Hartnagel, H. L. (1999):
Microwave measurement.
In: J. G. Webster, editor, The Measurement, Instrumentation and Sensors Handbook, chapter 55.1-55.5. CRC Press, Boca Raton, [Article]

Dehé, Alfons ; Peerlings, J. ; Pfeiffer, J. ; Riemenschneider, R. ; Vogt, A. ; Streubel, K. ; Künzel, H. ; Meißner, P. ; Hartnagel, H. L. (1998):
III-V Compound semiconductor micromachined actuators for long resonator tunable Fabry-Pérot detectors.
In: Sensors and Actuators A : Physical, 68 (1-3), pp. 365-371. Elsevier, ISSN 0924-4247,
DOI: 10.1016/S0924-4247(98)00071-5,
[Article]

Arcioni, P. ; Bozzi, M. ; Conciauro, G. ; Hartnagel, H. L. ; Perregrini, ; Sacchi, ; Shaalan, M. ; Weinzierl, (1998):
A 430.5 GHz Quasi-Optical HBV Frequency Trip 1 er.
In: International Symposium on Space Terahertz Technology <9, 1998, Pasadena, Calif.>: Proceedings. S. 493-500, [Conference or Workshop Item]

Lin, Chih-I. ; Simon, A. ; Zhang, Jian ; Piironen, P. V. ; Möttönen, V. S. ; Hartnagel, H. L. ; Räisänen, A. V. (1998):
Anti-parallel planar Schottky diodes for subharmonically pumped mixer.
In: International Conference on Infrared Millimeter Waves < 23, 1998, Colchester, UK>: Proceedings. S. 90-91, [Conference or Workshop Item]

Arcioni, P. ; Bozzi, M. ; Conciauro, G. ; Hartnagel, H. L. ; Perregrini, L. ; Shaalan, M. ; Weinzierl, (1998):
Design and optimisation of quasi-optical frequency multipliers.
In: International Conference on Infrared and Millimeter Waves <23, 1998, Colchester, UK>: Proceedings, [Conference or Workshop Item]

Arslan, Deniz ; Hofmann, ; Greiner, ; Hartnagel, H. L. (1998):
Fabrication and characterization of a GaAs field emission triode for low voltage operation at atmospheric pressure.
In: IVMC´98: International Vacuum Microelectronics Conference <11, 1998, Asheville, NC>: Proceedings, [Conference or Workshop Item]

Peerlings, Joachim ; Riemenschneider, R. ; Strassner, M. ; Scheuer, V. ; Naveen Kumar, V. ; Mutamba, K. ; Pfeiffer, J. ; Herbst, S. ; Hartnagel, H. L. (1998):
In GaAs/InP Fabry-Pérot pin receiver for dense wavelength division multiplex systems.
In: ECOC´98: European Conference on Optical Communications <24, 1998, Madrid>: Proceedings, [Conference or Workshop Item]

Pfeiffer, Joachim ; Riemenschneider, R. ; Peerlings, J. ; Dehé, A. ; Mutamba, K. ; Meissner, P. ; Hartnagel, H. L. (1998):
InP bulk micromachined tunable Bragg mirrors for optical filter applications in WDM systems.
In: WOCSDICE´98: Workshop on Compound Semiconductor Devices and Integrated Circuits <22,1998, Berlin>: Proceedings. S. 103-104, [Conference or Workshop Item]

Sim, St. K. H. ; Li, ; Sigurdardottir, A. ; Mutamba, ; Hartnagel, H. L. (1998):
Intersubband absorption in a typ-I interdiffused quantum-well infrared photodetector.
In: PHOTONICS´98: International Conference on Fiber Optics and Photonics <1998, Delhi>: Proceedings, [Conference or Workshop Item]

Sim, St. K. H. ; Mutamba, ; Sigurdardottir, A. ; Hartnagel, H. L. (1998):
Medium wavelength infrared detector with diffused Al x In 1-x Sb/InSb quantum-wells structure.
In: HKEDM´98: Hong Kong Electron. Dev. Meeting <1998, Hong Kong>: Proceedings, [Conference or Workshop Item]

Miranda-Pantoja, J. M. ; Vogt, Alexander ; Schuessler, M. ; Shaalan, M. ; Matulionis, A. ; Sebastian, J. L. ; Hartnagel, H. L. (1998):
Microwave noise measurements on Al 0.3Ga 0.7As/GaAs channels grown by molecular beam epitaxy using As2 and As4.
In: Journal of semiconductor science and technology. 1998, H. 13, S. 833-836, [Article]

Vogt, Alexander ; Simon, A. ; Weber, ; Hartnagel, H. L. ; Schikora, J. ; Buschmann, V. ; Fuess, H. (1998):
Non-annealed Ohmic contacts to p-GaSb grown by molecular beam epitaxy.
In: EXMATEC´98: International Workshop on Expert Evaluation and Control Compound Semiconductor Materials and Technologies <1998, Cardiff>: Proceedings, [Conference or Workshop Item]

Arcioni, P. ; Conciauro, G. ; Perregrini, L. ; Bozzi, M. ; Shaalan, M. ; Hartnagel, H. L. (1998):
Numerical modeling of quasi-optical frequency multipliers.
In: International Conference on Millimeter and Submillimeter Waves and Applications <4, 1998, S.Diego, California USA>: Proceedings, [Conference or Workshop Item]

Vogt, Alexander ; Simon, A. ; Hartnagel, H. L. ; Schikora, J. ; Buschmann, V. ; Rodewald, M. ; Fuess, H. ; Fascko, S. ; Koerdt, C. ; Kurz, H. (1998):
Ohmic contact formation mechanics of the PdGeAu system on n-type GaSb grown by molecular beam epitaxy.
In: Journal of Applied Physics, 83 (12), pp. 7715-7719. American Institute of Physics, ISSN 0021-8979,
[Article]

Vogt, Alexander ; Simon, A. ; Hartnagel, H. L. ; Schikora, J. ; Buschmann, V. ; Rodewald, M. ; Fuess, H. ; Fascko, S. ; Kurz, H. (1998):
Ohmsche Kontakte des Systems Pd/Ge/Au auf n-GaSb.
In: Jahrestagung Deutsche Gesellschaft für Kristallographie <6, 1998, Karlsruhe>: Tagungsbd., [Conference or Workshop Item]

Grajal, J. ; Krozer, V. ; Maldonado, F. ; Gonzalez, E. ; Lin, C. I. ; Hartnagel, H. L. (1998):
Tripler circuit design with Schottky varactors.
In: International Conference Terahertz Electronics <6,1998, Leeds, UK>: Proceedings. S. 153-156, [Conference or Workshop Item]

Shaalan, Mohamed ; Weinzierl, J. ; Bozzi, M. ; Hartnagel, H. L. (1998):
An approach towards understanding an open-structure frequency-doubler.
In: IEEE Semiconductor Conference <1998, Lisboa>: Proceedings, [Conference or Workshop Item]

Mutamba, Kabula ; Sigurdardottir, A. ; Vogt, Alexander ; Hartnagel, H. L. ; Li, E. H. (1998):
A comparative study of uniaxial pressure effects in intraband AlGaAs/GaAs and interband in As/AlSb/GaSb resonant tunneling diodes.
In: Applied physics letters. 72 (1998), H.13, S.1629-1631, [Article]

Arslan, Deniz ; Dehé, A. ; Hartnagel, H. L. (1998):
A new concept of lateral GaAs field emitter for sensor applications.
In: IVMC´98: International Vacuum Microelectronics Conference <11,1998, Asheville, NC>: Proceedings, [Conference or Workshop Item]

Arcioni, P. ; Bozzi, M. ; Conciauro, G. ; Hartnagel, H. L. ; Perregrini, L. ; Shaalan, M. (1998):
A novel CAD-tool for the optimization of quasi-optical frequency multipliers.
In: ESA Workshop on Millimeter Wave Technology and Applications <2, 1998, Espoo, Finland>: Proceedings. S. 479-484, [Conference or Workshop Item]

DasGupta, A. ; Arslan, D. ; Sigurdardottir, A. ; Hartnagel, H. L. (1998):
A novel self-consistent simulator for current-density-voltage-characteristics of semiconductor field emitters.
In: Applied physicics letters. 72 (1998), H. 10, S. 1220-1222, [Article]

Dehe, A. ; Klingbeil, Harald ; Weil, C. ; Hartnagel, H. L. (1998):
Membrane-Supported Coplanar Waveguides for MMIC and Sensor Application.
In: IEEE Microwave and Guided Wave Letters, 8 (5), pp. 185-187. [Article]

Lin, Chih-I. ; Simon, A. ; Rodriguez-Girones, M. ; Hartnagel, H. L. ; Zimmermann, P. ; Zimmermann, R. (1997):
Substrateless Schottky diodes for THz applications.
In: International Symposium on Space Terahertz Technology <8, 1997, Harvard Univ., Cambridge, Mass.>: Proceedings, [Conference or Workshop Item]

Shaalan, Mohamed ; Bozzi, M. ; Weinzierl, J. ; Beilenhoff, K. ; Conciauro, G. ; Brand, H. ; Hartnagel, H. L. (1997):
A 300 GHz quasioptical Schottky frequency doubler.
In: Journal of infrared and millimeter waves. 18 (1997), No. 12, [Article]

Vogt, Alexander ; Brandt, ; Sigurdardottir, A. ; Schüßler, ; Pena, ; Simon, ; Hartnagel, H. L. ; Rodewald, ; Roesner, (1997):
Characterisation of degradation mechanisms in resonant tunneling diodes.
In: European Symposium of Electron Devices, Failure Physics and Analysis <8, 1997, Arcachon, France>: Proceedings. S. 1691-1694, [Conference or Workshop Item]

Vogt, Alexander ; Brandt, ; Sigurdardottir, A. ; Schüssler, ; Pena, ; Simon, ; Hartnagel, H. L. ; Rodewald, ; Roesner, (1997):
Characterisation of degradation mechanisms in resonant tunnelling diodes.
In: Microelectronics and reliability, 37 (10-11), pp. 1691-1694. Elsevier, ISSN 1872-941X,
[Article]

Grajal, J. ; Krozer, V. ; Gonzalez, P. ; Gismero, J. ; Maldonado, F. ; Lin, C. I. ; Simon, A. ; Hartnagel, H. L. (1997):
Characterization of Schottky diode performance by numerical simulation coupled with harmonic balance.
In: European Microwave Conference <27, 1997, Jerusalem>: Proceedings, [Conference or Workshop Item]

Mutamba, Kabula ; Sigurdardottir, A. ; Hartnagel, H. L. (1997):
Concept of nanometric high density charge coupled devices.
In: Workshop on Innovative Circuits and Systems for Nano Electronics <2, 1997, Delft, NL>: Proceedings, [Conference or Workshop Item]

Gottwald, P. ; Kräutle, ; Szentpali, B. ; Kincses, Z. ; Hartnagel, H. L. (1997):
Damage characterization of InP after reactive ion etching using the low-frequency noise measurement technique.
In: Solid state electronics, 41 (4), pp. 539-545. Elsevier, ISSN 0038-1101,
[Article]

Shaalan, Mohamed ; Bozzi, M. ; Arcioni, P. ; Perregrini, L. ; Weinzierl, J. ; Conciauro, G. ; Hartnagel, H. L. (1997):
Design of planar antenna array for quasi-optical frequency tripler.
In: International Workshop on Terahertz Electronics <5, 1997, Grenoble, France>: Proceedings, [Conference or Workshop Item]

Shaalan, Mohamed ; Bozzi, M. ; Weinzierl, J. ; Miranda, J. ; Vogt, Alexander ; Weber, J. ; Hartnagel, H. L. ; Conciauro, G. (1997):
First design of a 430 GHz quasioptical HBV tripler.
In: International Workshop on Terahertz Electronics <5, 1997, Grenoble, France>: Proceedings, [Conference or Workshop Item]

Peerlings, Joachim ; Dehé, A. ; Tilsch, M. ; Hebeler, C. ; Langenhan, F. ; Meißner, P. ; Hartnagel, H. L. (1997):
GaAs/AlAs micromachined tunable Fabry-Pérot filters for dense wavelength division multiplex systems.
In: International Conference on Integrated Optics and Optical Fibre Communications <11, 1997, Edinburgh, UK>: Proceedings, [Conference or Workshop Item]

Peerlings, Joachim ; Dehé, A. ; Vogt, Alexander ; Tilsch, M. ; Hebeler, C. ; Langenhan, F. ; Meißner, P. ; Hartnagel, H. L. (1997):
GaAs/AlAs micromachined tunable Fabry-Pérot filters with long resonant cavity.
In: Eurosensors <11, 1997, Warszawa, Poland>: Proceedings, [Conference or Workshop Item]

Sigurdardottir, Anna ; Mutamba, K. ; Vogt, Alexander ; Hartnagel, H. L. (1997):
Investigation on the tunneling effect in stressed InAs/AlSb/GaSb-resonant-tunneling diodes.
In: Workshop on Compound Semiconductor Devices and Integrated Circuits <21, 1997, Scheveningen, NL>: Proceedings, [Conference or Workshop Item]

Peerlings, Joachim ; Dehé, A. ; Vogt, Alexander ; Tilsch, M. ; Hebeler, C. ; Langenhan, F. ; Meißner, P. ; Hartnagel, H. L. (1997):
Long resonator micromachined tunable GaAs/AlAs Fabry-Pérot filter.
In: IEEE Photonics technology letters. 9 (1997), 9, S. 1235-1237, [Article]

Tiginyanu, I. ; Irmer, G. ; Monecke, J. ; Hartnagel, H. L. (1997):
MicroRaman scattering study of surface-related phonon modes in porous GaP.
In: Physical review. B 55 (1997), S. 6739-6742, [Article]

Liberis, J. ; Matulionis, A. ; Sakalas, P. ; Saltis, R. ; Dozsa, L. ; Szentpali, B. ; Tuyen, V. van ; Hartnagel, H. L. ; Mutamba, K. ; Sigurdardottir, A. ; Vogt, A. (1997):
Microwave noise in unipolar diodes with nanometric barriers.
In: International Conference on Noise in Physical Systems and 1/f Fluctuations, pp. 67-70,
Singapore, World Scientific, International Conference on Noise in Physical Systems and 1/f Fluctuations, Leuven, 14.-18. July 1997, [Conference or Workshop Item]

Mees, J. ; Ekstrom, H. ; Kollberg, E. L. ; Eleftheriades, G. V. ; Mosig, J. R. ; Räisänen, A. V. ; Piironen, P. ; Hartnagel, H. L. ; Simon, A. (1997):
Open structure integrated Schottky receiver for space applications.
In: ESTEC Antenna Workshop on Millimeter Wave Antenna Technology and Antenna Measurements <20, 1997, Noordwijk, NL>: Proceedings, Noordwijk, [Conference or Workshop Item]

Tiginyanu, I. ; Irmer, G. ; Monecke, J. ; Vogt, Alexander ; Hartnagel, H. L. (1997):
Porosity-induced modification of the phonon spectrum of n-GaAs.
In: Semiconductor science technology. 12 (1997), S. 491-493, [Article]

Lin, Chih-I. ; Krozer, V. ; Grajal, ; Simon, A. ; Hartnagel, H. L. (1997):
Schottky varactor diode optimation for frequency multipliers.
In: International Workshop on Terahertz Electronics <5, 1997, Grenoble>: Proceedings, [Conference or Workshop Item]

Mutamba, Kabula ; Sigurdardottir, A. ; Vogt, Alexander ; Hartnagel, H. L. (1997):
Stress effects in AlGaAs/GaAs and InAs/AlSb/GaSb RTDs for sensing applications.
In: Phantoms Strategic Domain Meeting on Physics and Technology of Mesoscopic Systems <1997, Aachen, Germany>: Abstracts, [Conference or Workshop Item]

Shaalan, Mohamed ; Bozzi, M. ; Beilenhoff, K. ; Conciauro, G. ; Hartnagel, H. L. ; Weinzierl, J. ; Rehm, G. ; Steup, D. ; Brand, H. (1997):
An antenna array for quasi-optical frequency multiplier applications.
In: ESTEC Antenna Workshop on Millimetre Wave Antenna Technology and Antenna Measurements <20, 1997, Noordwijk, NL>: Proceedings, [Conference or Workshop Item]

Steinhagen, F. ; Hillmer, H. ; Lösch, R. ; Schlapp, W. ; Göbel, R. ; Kuphal, E. ; Hartnagel, H. L. ; Burkhard, H. (1996):
High-speed complex-coupled strain-compensated AlGaInAs/InP 1.5µm DFB laser diodes.
In: Proceedings of 8th International Conference on Indium Phosphide and Related Materials, pp. 777-780,
IEEE, 8th International Conference on Indium Phosphide and Related Materials, Schwäbisch Gmünd, Germany, 21.-25.04.1996, ISBN 0-7803-3283-0,
[Conference or Workshop Item]

Lin, Chih-I. ; Simon, A. ; Hartnagel, H. L. (1996):
Fabrication of substrateless Whiskercontacted Schottky diodes for THz applications.
In: International Workshop on Terahertz Electronics <4, 1996, Erlangen>: Proceedings, [Conference or Workshop Item]

Aller, Ingo ; Schweeger, ; Lang, ; Hartnagel, H. L. ; Dolt, ; Hohenberg, Günter (1996):
GaAs piezotransistor for dynamic pressure measurements at high temperatures.
In: Applied physics letters. 69 (1996), S. 403-405, [Article]

Micheel, Lutz ; Hartnagel, H. L. (1996):
Interband RTDs with nanoelectronic HBT-LED structures for multiple-valued computation.
In: IEEE Multivalued Conference <1996, Santiago die Compostela>: Proceedings, [Conference or Workshop Item]

Beilenhoff, Klaus ; Klingbeil, K. ; Hartnagel, H. L. (1996):
Parasitic effects of CPW discontinuities for MMIC applications.
In: European Microwave Conference <26, 1996, Praha>: Proceedings, [Conference or Workshop Item]

Mutamba, Kabula ; Flath, ; Sigurdardottir, A. ; Vogt, Alexander ; Hartnagel, H. L. (1996):
Pressure effects in AlGaAs/GaAs resonant tunnelling diodes for applications in semiconductor sensors.
In: Lithunian journal of physics. 36 (1996), No. 6, S. 563-565, [Article]

Mutamba, Kabula ; Flath, ; Vogt, Alexander ; Sigurdardottir, A. ; Dehé, A. ; Hartnagel, H. L. (1996):
Pressure sensors based on stress dependence of AlGaAs/GaAs RTD characteristics.
In: Workshop on Heterostructures Technology <1996, Lille>: Proceedings, [Conference or Workshop Item]

Wischmeyer, Frank ; Horn, ; Niemann, E. ; Hartnagel, H. L. (1996):
Rastertunnelmikroskopie als Methode zur Untersuchung des Interfaces zwischen CVD-gewachsenem 3C-SiC und Silizium.
In: Deutsche Physikalische Gesellschaft: Frühjahrstagung <1996, Regensburg>; Tagungsbd, [Conference or Workshop Item]

Aller, Ingo ; Hartnagel, H. L. (1996):
Selective area growth of InP by plasma assisted solid-source epitaxy.
In: Journal of electronic materials. 25 (1996), S. 421-424, [Article]

Böttner, Th. ; Kräutle, H. ; Kuphal, E. ; Miethe, K. ; Hartnagel, H. L. (1996):
Surface- and sidewall-damage of InP-based optoelectronic devices during reactive ion etching using CH4/H2.
In: International Conference on Indium Phosphide and Related Materials : 8, 1996, Schwäbisch Gmünd ; Proceedings,
[Conference or Workshop Item]

Mutamba, Kabula ; Sigurdardottir, A. ; Miao, J. ; Dehé, A. ; Aller, ; Hartnagel, H. L. (1996):
Uniaxial stress dependence of AlGaAs/GaAs RTD characteristics for sensor applications.
In: Micromechanics Europe Conference <1996, Barcelona, Spain>: Proceedings. S. 85, [Conference or Workshop Item]

Berg, M. ; Hackbarth, T. ; Maile, B. E. ; Dickmann, J. ; Guhl, R. ; Adelseck, B. ; Hartnagel, H. L. (1996):
W-band MMIC amplifiers based on quarter micron gate-length InP HEMTs and coplanar waveguides.
In: Proceedings of 8th International Conference on Indium Phosphide and Related Materials,
Piscataway, NJ, IEEE, Schwäbisch Gmünd, 21-25 April 1996, ISBN 0-7803-3283-0,
DOI: 10.1109/ICIPRM.1996.491937,
[Conference or Workshop Item]

Steinhagen, F. ; Hillmer, H. ; Lösch, R. ; Schlapp, W. ; Walter, H. ; Göbel, R. ; Kuphal, E. ; Hartnagel, H. L. ; Burkhard, H. (1995):
AlGaInAs/InP 1.5 My-m MQW DFB laser diodes exceeding 20GHz bandwidth.
In: Electronics Letters, 31 (4), pp. 274-275. IEE, ISSN 0013-5194,
DOI: 10.1049/el:19950212,
[Article]

Steinhagen, F. ; Hillmer, H. ; Hansmann, S. ; Mahrdiek, S. ; Lösch, R. ; Schlapp, W. ; Walter, H. ; Göbel, G. ; Dinges, H. W. ; Kuphal, E. ; Hartnagel, H. L. ; Burkhard, H. (1995):
AlGaInAs/InP 1.5 My-m DFB laser diodes for high capacity transmission modules.
In: Technical digest, pp. 52-53,
Chinese University Press, 10th International Conference on Integrated Optics and Optical Fibre Communication, Hong Kong, 26.-30.06.1995, ISBN 962-201-709-6,
[Conference or Workshop Item]

Beilenhoff, Klaus ; Heinrich, ; Hartnagel, H. L. (1995):
Analysis of MIM series capacitances for coplanar MMICs.
In: Microwaves and optoelectronics: MIOP '95 <1995, Sindelfingen>: Digest. S. 124-128, [Conference or Workshop Item]

Gottwald, P. ; Riemenschneider, R. ; Szentpali, B. ; Hartnagel, H. L. ; Kincses, Z. ; Ruszinko, M. (1995):
Comparison of photo- and plasma-assisted passivating process effects on GaAs devices by means of low-frequency noise measurements.
In: Solid state electronics, 38 (2), pp. 413-417. Elsevier, ISSN 0038-1101,
DOI: 10.1016/0038-1101(94)00100-T,
[Article]

Pirling, Thilo ; Fricke, ; Schüßler, ; Lee, ; Fuess, H. ; Hartnagel, H. L. (1995):
Investigations on Pd/In-based high temperature stable ohmic contacts on GaAs by x-ray reflectometry and diffractometry.
In: Materials science and engineering. B 29 (1995), S. 70-73, [Article]

Sigurdardottir, Anna ; Krozer, V. ; Hartnagel, H. L. (1995):
Modeling and design of InAs/AlSb-resonant tunneling diodes.
In: Applied physics letters. 67 (1995), No. 22, S. 3313-3315, [Article]

Aller, Ingo ; Hartnagel, H. L. (1995):
Selective growth of InP by plasma assisted solid-source epitaxy.
In: International Conference on Indium Phosphide and Related Materials <7, 1995, Sapporo, Japan>: Proceedings. S. 325-328, [Conference or Workshop Item]

Grajal, J. ; Krozer, V. ; Hartnagel, H. L. ; Gismero, J. (1995):
Simulation of the influence of interface states on HBTs.
In: Workshop on Compound Semiconductor Devices and Integrated Circuits: WOCSDICE 95 <19, 1995, Stockholm, Schweden>: Abstracts, [Conference or Workshop Item]

Grüb, Andreas ; Simon, ; Krozer, ; Lin, ; Shaalan, ; Beilenhoff, ; Sigurdardottir, A. ; Hartnagel, H. L. (1995):
Terahertz research at TH Darmstadt.
In: International Workshop on Terahertz Electronics <3, 1995, Zermatt, Schweiz>: Proceedings, [Conference or Workshop Item]

Pirling, Thilo ; Fuess, H. ; Hartnagel, H. L. ; Rück, (1994):
Investigations on Pd/In metallisations on GaAs.
In: Gesellschaft für Schwerionenforschung: Scientific report 1994. - Darmstadt: GSI, 1995. S. 184, Darmstadt, GSI, [Book Section]

Beilenhoff, K. ; Klingbeil, Harald ; Heinrich, W. ; Hartnagel, H. L. (1993):
Open and Short Circuits in Coplanar MMIC�s.
In: IEEE Transactions on Microwave Theory and Techniques, 41 (9), pp. 1534-1537. [Article]