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18 April 2016 Photonic crystal based 2D integrating cell for sensing applications
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We present a concept of a silicon slab based 2D integrating cell where photonic crystal (PhC) reflectors are used in order to confine light in a two-dimensional area to acquire a long propagation length. The evanescent field of the guided wave can be used for sensing applications. We use FDTD simulations to investigate the dependence of the reflectivity of photonic crystal mirrors with a hexagonal lattice. The reflectivity in ΓM direction demonstrates reduced vertical losses compared to the ΓK direction and can be further improved by adiabatically tapering the hole radii of the photonic crystal. A small hexagonal 2D integrating cell was studied with PhC boundaries oriented in ΓM and ΓK direction. It is shown that average reflectivities of 99% can be obtained in a rectangular 2D cell with optimized reflector design, limited only by residual vertical scattering losses at the PhC boundary. This reflectivity is already comparable to the best metallic reflectors.
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Lena Simone Fohrmann, Alexander Yu. Petrov, Gerrit Sommer, Thomas Krauss, and Manfred Eich "Photonic crystal based 2D integrating cell for sensing applications", Proc. SPIE 9885, Photonic Crystal Materials and Devices XII, 98850X (18 April 2016);

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