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Semiconductor quantum optics with tailored photonic nanostructures

Abstract

This thesis describes detailed investigations of the effects of photonic nanostructures on the light emission properties of self-assembled InGaAs quantum dots. Nanoscale optical cavities and waveguides are employed to enhance the interaction between light and matter, i.e. photons and excitons, up to the point where optical non-linearities appear at the quantum (single photon) level. Such non-linearities are an essential component for the realization of hardware for photon based quantum computing since they can be used for the creation and detection of non-classical states of light and may open the way to new genres of quantum optoelectronic devices such as optical modulators and optical transistors. For single semiconductor quantum dots in photonic crystal nanocavities we investigate the coupling between excitonic transitions and the highly localized mode of the optical cavity. We explore the non-resonant coupling mechanisms which allow excitons to couple to the cavity mode, even when they are not spectrally in resonance. This effect is not observed for atomic cavity quantum electrodynamics experiments and its origin is traced to phonon-assisted scattering for small detunings ({delta}E<{proportional_to}5 meV) and a multi-exciton-based, Auger-like process for larger detunings ({delta}E >{proportional_to}5 meV). For quantum dots in high-Q cavities we observe the coherent coupling between exciton  More>>
Authors:
Publication Date:
Jun 15, 2011
Product Type:
Thesis/Dissertation
Report Number:
INIS-DE-1220
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.); Related Information: Selected Topics of Semiconductor Physics and Technology v. 129
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; AUGER EFFECT; BOSON-EXCHANGE MODELS; CAVITY RESONATORS; COUPLING; ENERGY-LEVEL TRANSITIONS; EXCITONS; GALLIUM ARSENIDES; INDIUM ARSENIDES; NONLINEAR OPTICS; OPTICAL MODES; PHONONS; PHOTON EMISSION; QUANTUM DOTS; WAVE PROPAGATION; WAVEGUIDES
OSTI ID:
21520492
Research Organizations:
Technische Univ. Muenchen, Garching (Germany). Walter-Schottky-Inst. fuer Physikalische Grundlagen der Halbleiterelektronik; Technische Univ. Muenchen, Garching (Germany). Fakultaet fuer Physik
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISBN 978-3-941650-29-9; TRN: DE12F0484
Availability:
Commercial reproduction prohibited; INIS; OSTI as DE21520492
Submitting Site:
DEN
Size:
256 pages
Announcement Date:
Jan 17, 2012

Citation Formats

Laucht, Arne. Semiconductor quantum optics with tailored photonic nanostructures. Germany: N. p., 2011. Web.
Laucht, Arne. Semiconductor quantum optics with tailored photonic nanostructures. Germany.
Laucht, Arne. 2011. "Semiconductor quantum optics with tailored photonic nanostructures." Germany.
@misc{etde_21520492,
title = {Semiconductor quantum optics with tailored photonic nanostructures}
author = {Laucht, Arne}
abstractNote = {This thesis describes detailed investigations of the effects of photonic nanostructures on the light emission properties of self-assembled InGaAs quantum dots. Nanoscale optical cavities and waveguides are employed to enhance the interaction between light and matter, i.e. photons and excitons, up to the point where optical non-linearities appear at the quantum (single photon) level. Such non-linearities are an essential component for the realization of hardware for photon based quantum computing since they can be used for the creation and detection of non-classical states of light and may open the way to new genres of quantum optoelectronic devices such as optical modulators and optical transistors. For single semiconductor quantum dots in photonic crystal nanocavities we investigate the coupling between excitonic transitions and the highly localized mode of the optical cavity. We explore the non-resonant coupling mechanisms which allow excitons to couple to the cavity mode, even when they are not spectrally in resonance. This effect is not observed for atomic cavity quantum electrodynamics experiments and its origin is traced to phonon-assisted scattering for small detunings ({delta}E<{proportional_to}5 meV) and a multi-exciton-based, Auger-like process for larger detunings ({delta}E >{proportional_to}5 meV). For quantum dots in high-Q cavities we observe the coherent coupling between exciton and cavity mode in the strong coupling regime of light-matter interaction, probe the influence of pure dephasing on the coherent interaction at high excitation levels and high lattice temperatures, and examine the coupling of two spatially separated quantum dots via the exchange of real and virtual photons mediated by the cavity mode. Furthermore, we study the spontaneous emission properties of quantum dots in photonic crystal waveguide structures, estimate the fraction of all photons emitted into the propagating waveguide mode, and demonstrate the on-chip generation of single photon emission into the waveguide. The results obtained during the course of this thesis contribute significantly to the understanding of coupling phenomena between excitons in self-assembled quantum dots and optical modes of tailored photonic nanostructures realized on the basis of two-dimensional photonic crystals. While we highlight the potential for advanced applications in the direction of quantum optics and quantum computation, we also identify some of the challenges which will need to be overcome on the way. (orig.)}
place = {Germany}
year = {2011}
month = {Jun}
}