Pyatkov, Felix (2017)
Waveguide-Integrated Electrically Driven Light-Emitting Carbon Nanotubes.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung

Kurzbeschreibung (Abstract)

In this work proof-of-concept devices with light-emitting electrically driven carbon nanotubes (CNTs) integrated in nanophotonic environments are presented. Electroluminescent and incandescent CNTs can be envisioned as waveguide-integrated light sources for future on-chip data communication due to their unique structural, electrical and optical properties. The challenge thereby is to integrate and electrically contact solution processed CNTs across CMOS compatible waveguide structures and to enforce efficient coupling of light from the CNT into the waveguide. Various nanophotonic devices with versatile functionalities were fabricated and equipped with CNTs by means of site-selective dielectrophoresis. The realized electrically driven CNT-based light emitters integrated with nanophotonic circuits allow for efficient coupling and propagation of light in waveguides over centimeter distances. Furthermore, in scope of the thesis it was demonstrated how spectral properties of a CNT emitter can be controlled directly on a chip with passive devices using grating structures, Mach-Zehnder interferometers and directional couplers. Moreover, it was observed that in combination with a one-dimensional photonic crystal cavity CNT becomes an emitter with exceptionally narrow linewidths at desired adjustable wavelength. Finally, the usage of electrically driven CNTs as fast waveguide-integrated light emitters with Gbit/s response speed was shown. Therefore direct, near-field coupling of electrically generated CNT-emitted light into a waveguide, opposed to far-field fiber coupling of external light sources, opens new avenues for scalable nanoscale optoelectronic systems in a CMOS compatible framework.

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