Fabry-Perot Etalon in Hole-type Photonic Crystal as an Optical Sensor
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.
photonic crystal self-collimation Fabry-Perot etalon optical sensor
Xiyao Chen Yufei Wang Zhumei Lin Nan Lin Guimin Lin Yishen Qiu Junzhen Jiang Bo Ni Jibo Bai
Dept.of Physics and Electronic Information Engineering,Minjiang Univ.,Fuzhou 350108,China; School of Physics and Electromechanical Engineering,Longyan Univ.,Longyan 364012,China School of Physics and Optoelectronics Technology,Fujian Normal Univ.,Fuzhou 350007,China
国际会议
2008亚太光通信会议(Asia-Pacific Optical Communications 2008)
杭州
英文
2008-10-26（万方平台首次上网日期，不代表论文的发表时间）