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Monday 12th july 2021, 10:00 am, videoconferencing

Nessim JEBALI defends his PhD thesis

« Contribution to the study of the non-linear properties of chalcogenide glass waveguides and micro-resonators »

guided optics ; integrated optics ; nonlinear optics ; nonlinear dynamics ; coupled micro-resonators ; chalcogenide glasses


Chalcogenide glasses have raised tremendous attention in recent decades due to their unique optical properties, which make them promising candidate materials for the development of a wide range of photonic applications. In particular, all optical processing in near-infrared telecommunication window is taking advantage of their high optical nonlinearities. These glasses also exhibit low maximum phonon energies which yield broad transparency window from visible to mid-infrared wavelength ranges. Optical sensing platforms could therefore also benefit from the development of these materials. This thesis deals with the development and study of photonic structures made of chalcogenide glasses which can offer solutions based on nonlinear optics for all-optical processing and optical sensing. The dispersion optimized GeSbSe waveguides to obtain a large FWM conversion bandwidth in the near-infrared or to achieve a supercontinuum in the near and mid-infrared regime was studied. A qualitative analysis on the different dimensions of coupled and single micro-resonators was carried out in the near- and mid-infrared regime, respectively. A study of nonlinear dynamical behaviours of a system of coupled microring resonators is carried out using the FDTD method which involves a full numerical integration of Maxwell’s equation. The obtained results were then compared to the CMTs. FWM experiments were also performed on a set of GeSbSe waveguides having different index contrasts, different waveguiding structures and different geometrical dimensions. A conversion efficiency of -60 dB was obtained in a 3.8 cm long GeSbSe rib waveguide and a large FWM bandwidth that can span the L and S bands was achieved in high contrast GeSbSe waveguides.

Committee members
Gilles RENVERSEZ Professor, Institut Fresnel, AMUExaminator
Pascal MASSELIN Associate Professor, LPCA, ULCOExaminator
Monique THUAL Professor, Institut Foton, UR1Member
Stefania RESIDORI Director of Research, INPHYNI, CNRSMember
Loïc BODIOU Assistant Professor, Institut Foton, UR1PhD Manager
Joël CHARRIER Associate Professor, Institut Foton, UR1PhD Manager
Yannick DUMEIGE Associate Professor, Institut Foton, UR1PhD Supervisor

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