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Theoritical and experimental study of optical coupling in optomechanical systems

Abstract : In this work, we study ring shaped suspended optomechanical resonators, and Sub-Wavelength Grating (SWG) based optomechanical resonators.The first approach presented - suspended ring resonators - serves as an introduction over general equations and experimental techniques.On a second approach, we propose to co-integrate SWG waveguides inside of a Fabry-Perot cavity. The refractive index of a SWG waveguide is periodic with a pitch way smaller than the wavelength, that results in a lossless propagation with no diffraction effects. The medium can be approximated as uniform, with an averaging effect over its refractive index.In particular, we evidence new optomechanical mechanisms arising from the SWG waveguide, and expect a strong optomechanical coupling strength.All along the thesis, a systematic optical, mechanical, and optomechanical study of each structure is conducted, both with simplified analytical models and numerical simulations. The technological realisation of the structures over 200 mm Silicon wafers is presented, along with optical and optomechanical experimental characterisations.
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Submitted on : Wednesday, September 23, 2020 - 4:07:24 PM
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Boris Taurel. Theoritical and experimental study of optical coupling in optomechanical systems. Condensed Matter [cond-mat]. Université Grenoble Alpes [2020-..], 2020. English. ⟨NNT : 2020GRALY006⟩. ⟨tel-02499125v2⟩

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