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Proceedings Paper

Fabry-Perot etalon in hole-type photonic crystal as an optical sensor
Author(s): Xiyao Chen; Yufei Wang; Zhumei Lin; Nan Lin; Guimin Lin; Yishen Qiu; Hui Li; Junzhen Jiang; Bo Ni; Jibo Bai
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Paper 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.

Paper Details

Date Published: 11 November 2008
PDF: 6 pages
Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71344B (11 November 2008); doi: 10.1117/12.803603
Show Author Affiliations
Xiyao Chen, Minjiang Univ. (China)
Yufei Wang, Longyan Univ. (China)
Zhumei Lin, Minjiang Univ. (China)
Nan Lin, Minjiang Univ. (China)
Guimin Lin, Minjiang Univ. (China)
Yishen Qiu, Fujian Normal Univ. (China)
Hui Li, Fujian Normal Univ. (China)
Junzhen Jiang, Fujian Normal Univ. (China)
Bo Ni, Fujian Normal Univ. (China)
Jibo Bai, Fujian Normal Univ. (China)

Published in SPIE Proceedings Vol. 7134:
Passive Components and Fiber-based Devices V
Ming-Jun Li; Ping Shum; Ian H. White; Xingkun Wu, Editor(s)

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