Fabry-Perot etalon in hole-type photonic crystal as an optical sensor

Xiyao Chen; Yufei Wang; Zhumei Lin; Nan Lin; Guimin Lin; Yishen Qiu; Hui Li; Junzhen Jiang; Bo Ni; Jibo Bai

doi:10.1117/12.803603

11 November 2008 Fabry-Perot etalon in hole-type photonic crystal as an optical sensor

Xiyao Chen, Yufei Wang, Zhumei Lin, Nan Lin, Guimin Lin, Yishen Qiu, Hui Li, Junzhen Jiang, Bo Ni, Jibo Bai

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, and 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); https://doi.org/10.1117/12.803603

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KEYWORDS

Fabry–Perot interferometers

Photonic crystals

Optical sensors

Reflectors

Refractive index

Microfluidics

Dispersion

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