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2 July 2012 Phononic and phoxonic crystal slabs sensors
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We study theoretically the potentiality of phononic and dual phononic-photonic (the so-called phoxonic) crystals for liquid sensing applications. We investigate the existence of well-defined features (peaks or dips) in the transmission spectra of acoustic and optical waves and evaluate their sensitivity to the sound velocity or refractive index of the liquid environment. Several geometries are considered that can be divided into two sets depending on the direction of propagation of the incident waves with respect to the phononic/photonic crystal, namely in-plane and out-of-plane propagation configurations. In the first configuration, we study the in-plane transmission through a two-dimensional (2D) crystal made of cylindrical holes in a Si substrate where one row of holes is filled with a liquid; possibly, the infiltrated holes may have a different radius than the normal holes. Another geometry we have studied consists of a periodic array of ridges on top of a thin Si membrane with incident waves parallel to the slab. In the out-of-plane configuration, we calculate the transmission between two solid substrates connected by a periodic array of pillars as well as the normally incident transmission upon a phoxonic crystal constituted by a periodic array of holes in a slab.
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Bahram Djafari Rouhani, Yan Pennec, and Ralf Lucklum "Phononic and phoxonic crystal slabs sensors", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84250O (2 July 2012);


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