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
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiyao Chen, Xiyao Chen, Yufei Wang, Yufei Wang, Zhumei Lin, Zhumei Lin, Nan Lin, Nan Lin, Guimin Lin, Guimin Lin, Yishen Qiu, Yishen Qiu, Hui Li, Hui Li, Junzhen Jiang, Junzhen Jiang, Bo Ni, Bo Ni, Jibo Bai, 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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