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A theoretical study of a new sensing concept based on Bloch surface waves (BSWs), which utilizes a onedimensional photonic crystal (1DPhC) represented by a multilayer structure, is presented. 1DPhCs have a number of useful features, including physical and chemical robustness. We model the response of a BK7 prism/multilayer/analyte system in the Kretschmann configuration for s- and p-polarized waves. We show that the 1DPhC supports surface electromagnetic waves at frequencies within the forbidden transmission band of the multilayer structure. A dip in the reflectance spectrum for s-polarized wave represents the excitation of the BSW and this is demonstrated for air and gaseous analytes.
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M. Gryga, D. Ciprian, L. Gembalova, P. Hlubina, "Sensing of gaseous analytes via Bloch surface waves," Proc. SPIE 11354, Optical Sensing and Detection VI, 113541B (1 April 2020); https://doi.org/10.1117/12.2555713