Three-wave mixing in semiconductor whispering gallery mode microcavities

Abstract : Semiconductor whispering-gallery-mode (WGM) microresonators have already gained a prominent place in today's photonics, as an ideal environment for highly enhanced light-matter interactions like nonlinear wave mixing and optomechanics. These optical cavities can store optical energy on a sub-µm3 volume, by trapping light via total internai reflection. The interest drawn by WGM microcavities originates from their high quality factors and promise of applications for fundamental science and engineering purposes. Thanks to their versatility and high performances, they can be integrated on a photonic chip and involved in a wide set of applications, such as quantum-dot lasers, optomechanics, nanosensing, or quantum optics. This doctoral work deals with the study of three wave mixing processes in two different frameworks. First, I show the development made to fabricate some original micro-resonators that have enabled us to observe second harmonic generation around 775 nm, with a pump wavelength around 1550 nm. The obtained nonlinear efficiency is comparable to the state-of-the-art devices in the III-V platform. The second part of the experiments finds its place within the European project TREASURE. The main goal is the demonstration of an electrically pumped, CW THz emitter, based on difference frequency generation at room temperature. I present the measurements in the near-IR and THz regions performed to compare our results and simulations.
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Silvia Mariani. Three-wave mixing in semiconductor whispering gallery mode microcavities. Physics [physics]. Université Paris Diderot - Paris 7, 2014. English. ⟨tel-01113290⟩

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