Personne : Messaddeq, Younès
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Messaddeq
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Younès
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Université Laval. Département de physique, de génie physique et d'optique
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ncf11860592
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Publication Accès libre Silicon subwavelength grating waveguides with high-index chalcogenide glass cladding(Optical Society of America, 2021-06-17) Jean, Philippe; LaRochelle, Sophie; Shi, Wei; Messaddeq, Younès; Douaud, AlexandreSilicon subwavelength grating waveguides enable flexible design in integrated photonics through nano-scale refractive index engineering. Here, we explore the possibility of combining silicon subwavelength gratings waveguides with a high-index chalcogenide glass as a top cladding, thus modifying the waveguiding behavior and opening a new design axis for these structures. A detailed investigation of the heterogeneous SWG waveguide with high-index cladding is presented based on analytical and numerical simulations. We design, fabricate and characterize silicon subwavelength grating waveguide microring resonators with an As20S80 cladding. Thanks to As20S80 negative thermo-optic coefficient, we achieve near athermal behavior with a measured minimum thermally induced resonance shift of −1.54 pm/K, highlighting the potential of subwavelength grating waveguides for modal confinement engineering and to control light-matter interaction. We also show that the chalcogenide glass can be thermally reflowed to remove air gaps inside the cladding, resulting in a highly conformal structure. These types of waveguides can find application in reconfigurable photonics, nonlinear optics, metamaterials or slow light.Publication Accès libre Etchless chalcogenide microresonators monolithically coupled to silicon photonic waveguides(Optical Society of America, 2020-05-13) Messaddeq, Sandra Helena; Genest, Jérôme; Jean, Philippe; LaRochelle, Sophie; Shi, Wei; Messaddeq, Younès; Douaud, Alexandre; Michaud-Belleau, VincentIntegration of chalcogenide waveguides in silicon photonics can mitigate the prohibitive nonlinear losses ofsilicon while leveraging the mature CMOS-compatiblenanophotonic fabrication process. In this work, wedemonstrate, for the first time, a method of integratinghigh-Q chalcogenides microring resonators onto the sil-icon photonics platform without post-process etching.The method uses micro-trench filling and a novel ther-mal dewetting technique to form low-loss chalcogenidestrip waveguides. The microrings are integrated di-rectly inside silicon photonic circuits through evanes-cent coupling, providing an uncomplicated hybrid in-tegration scheme without the need to modify the exist-ing photonics foundry process. The microrings showa high quality factor exceeding 6⇥105near 1550 nmand propagation losses below 0.7 dB/cm, indicatinga promising solution for low-cost, compact nonlinearphotonic devices with applications in various fieldssuch as telecommunications and spectroscopy.