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Etude théorique et expérimentale de cavités photoniques en niobate de lithium - Application à la détection de gaz

Abstract : In this thesis we show how photonic crystal cavities can exploited for sensing application, provided that they are filled with a sensitive absorbent layer. A Lorentz dispersion model implemented in a 2D-FDTD code show that the absorption of the layer can be exploited for enhancing the sensitivity of the sensor. We found that a variation of the refractive index of 10¯⁷ leads to a variation of the transmittivity of 23 % at the resonance peak. Also, we will report the first study and realization of two types of lithium niobate photonic cavities (LiNbOз PhCs). The choice of the LiNbOз substrate is motivated by its capability of combining piezoelectric, electro-optical, acousto-optical, non-linear optical properties, which offers the perspective of controlling the operating point of photonic devices such as sensors. The cavities were fabricated by focused ion beam (FIB) milling, on annealed proton exchange (APE) strip waveguide. Numerical analysis with plane wave expansion method (PWE) has been realized to define the lattice parameters of the studied structures. The parameters were chosen to obtain a resonance mode at λ=1550 nm. This study was followed by finite difference time domain (FDTD) simulations to extract the transmission and reflexion spectra of the cavities. Experimental setup was mounted to characterize the PhCs cavities, where the incident light consists of a supercontinuum powerful white source. In addition, experimental near field measurements (SNOM) show the presence of a resonance mode at the defect region of the cavity.
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Submitted on : Friday, February 3, 2012 - 11:48:23 AM
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  • HAL Id : tel-00665911, version 1

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Jean Dahdah. Etude théorique et expérimentale de cavités photoniques en niobate de lithium - Application à la détection de gaz. Optique / photonique. Université de Franche-Comté, 2010. Français. ⟨NNT : ⟩. ⟨tel-00665911⟩

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