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Frequency Selective Optoelectronic Downconversion of a Terahertz Pulse Using ErAs:In(Al)GaAs Photoconductors

Fernandez Olvera, Anuar de Jesus ; Krause, Benedikt Leander ; Betancur-Perez, Andres ; Nandi, Uttam ; Dios, Cristina de ; Acedo, Pablo ; Preu, Sascha (2021):
Frequency Selective Optoelectronic Downconversion of a Terahertz Pulse Using ErAs:In(Al)GaAs Photoconductors. (Publisher's Version)
In: IEEE Access, 9, pp. 95391-95400. IEEE, ISSN 2169-3536,
DOI: 10.26083/tuprints-00019460,
[Article]

Abstract

We introduce a new scheme for the detection of terahertz pulses based on the frequency selective optoelectronic downconversion of its individual modes with a continous-wave (CW) ErAs:InGaAs photoconductive antenna (PCA) driven by a comb-based CW photonic signal. The detection scheme can be used as metrology tool for the analysis of the fundamental resolution and stability limits of terahertz pulses and the mode-locked-lasers (MLLs) that drives them, as well as an ultra-high-resolution measurement technique for terahertz components or gas spectroscopy. We demonstrate both applications by measuring the linewidth of two frequency components of the particular terahertz pulse analyzed here (one at 75 GHz and one at 340 GHz) and by measuring a very narrowband filter between 70 and 80 GHz. The main advantage of this technique with respect to other terahertz pulse detection schemes is its capability of performing ultra-high-resolution measurements without the need of unpractically long scanning ranges or synchronization of two MLLs.

Item Type: Article
Erschienen: 2021
Creators: Fernandez Olvera, Anuar de Jesus ; Krause, Benedikt Leander ; Betancur-Perez, Andres ; Nandi, Uttam ; Dios, Cristina de ; Acedo, Pablo ; Preu, Sascha
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Frequency Selective Optoelectronic Downconversion of a Terahertz Pulse Using ErAs:In(Al)GaAs Photoconductors
Language: English
Abstract:

We introduce a new scheme for the detection of terahertz pulses based on the frequency selective optoelectronic downconversion of its individual modes with a continous-wave (CW) ErAs:InGaAs photoconductive antenna (PCA) driven by a comb-based CW photonic signal. The detection scheme can be used as metrology tool for the analysis of the fundamental resolution and stability limits of terahertz pulses and the mode-locked-lasers (MLLs) that drives them, as well as an ultra-high-resolution measurement technique for terahertz components or gas spectroscopy. We demonstrate both applications by measuring the linewidth of two frequency components of the particular terahertz pulse analyzed here (one at 75 GHz and one at 340 GHz) and by measuring a very narrowband filter between 70 and 80 GHz. The main advantage of this technique with respect to other terahertz pulse detection schemes is its capability of performing ultra-high-resolution measurements without the need of unpractically long scanning ranges or synchronization of two MLLs.

Journal or Publication Title: IEEE Access
Journal volume: 9
Publisher: IEEE
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Terahertz Devices and Systems
Date Deposited: 06 Sep 2021 12:56
DOI: 10.26083/tuprints-00019460
Official URL: https://tuprints.ulb.tu-darmstadt.de/19460
URN: urn:nbn:de:tuda-tuprints-194603
Additional Information:

Keywords: Optical pulses, Principal component analysis , Pulse measurements, Frequency measurement, Tools , Timing jitter, Optical receivers, CW photoconductive detectors, ErAs:In(Al)GaAs photoconductors, FreSOD, noise in mode-locked lasers, pulsed terahertz emitters, frequency metrology

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