11 November 2008 Fabry-Perot etalon in hole-type photonic crystal as an optical sensor
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Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 71344B (2008) https://doi.org/10.1117/12.803603
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China
Abstract
A Fabry-Perot (FP) etalon constructed in a two-dimensional photonic crystal (2D PhC) utilizing self-collimation effect is proposed and investigated. The 2D PhC consists of a square lattice of air holes in silicon. It has square-shaped equal frequency contours (EFCs) in the frequency range of 0.275-0.295c/a for TE modes. The FP proposed consists of two PhC reflectors and one cavity between them. Light propagates in the photonic crystal employing self-collimation effect. The two reflectors have reflectivities of around 97.5% in the frequency range 0.275-0.295c/a. The FDTD calculation results show that the transmission spectrum of the FP etalon has a uniform peak spacing between 0.275c/a and 0.295c/a. The transmission spectrum shifts to the lower frequency as the refractive index of a fluid filling in the air holes in the FP cavity is increased. Therefore this etalon can work as an optical sensor for a gas and a liquid. The fluids whose refractive index vary within 1.0-1.5 can be sensed and detected. Its dimensions are only about tens of microns when the central operating wavelength is equal to 1550nm. So it can be applied as a micro-scale sensor.
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Xiyao Chen, Yufei Wang, Zhumei Lin, Nan Lin, Guimin Lin, Yishen Qiu, Hui Li, Junzhen Jiang, Bo Ni, Jibo Bai, "Fabry-Perot etalon in hole-type photonic crystal as an optical sensor", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71344B (11 November 2008); doi: 10.1117/12.803603; https://doi.org/10.1117/12.803603
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