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4 January 2008 An ultracompact refractive index gas-sensor based on photonic crystal microcavity
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An ultracompact gas-sensor based on the two-dimensional photonic crystal microcavity is presented. The sensor is formed by a point-defect resonant cavity. The transmission spectrums of the sensor with different ambient refractive indices ranging from 1.0 n = to 1.01 n = are calculated. The calculation results show that a change in ambient refractive index of Δn=1×10-4is apparent, the sensitivity of the sensor (Δλ/Δn) is achieved with 433nm/RIU(when lattice constant 520 a=520nm), where RIU means refractive index unit . The properties of the sensor are analyzed and calculated using the plane-wave expansion (PWE) method and simulated using the finite-difference time-domain (FDTD) method. Using the fabry-Perot cavity mode, the performances of the refractive index sensor are analyzed theoretically. The sensor is optimized using the photonic crystal waveguide structure and simulated using the FDTD method. As the small sensing area (~10μm2) of the device would require only ~1fL sample analyte, these ultracompact gas sensors would be widely used in little sample analyte in gas measurement.
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Xiaoling Wang, Naiguang Lu, Jun Zhu, and Guofan Jin "An ultracompact refractive index gas-sensor based on photonic crystal microcavity", Proc. SPIE 6831, Nanophotonics, Nanostructure, and Nanometrology II, 68310D (4 January 2008);

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