title: High-sensitivity temperature sensor using the ultrahigh order mode-enhanced Goos-Hänchen effect.
abstract: A high-sensitivity temperature sensor based on the enhanced Goos-Hänchen effect in a symmetrical metal-cladding waveguide is theoretically proposed and experimentally demonstrated. Owing to the high sensitivity of the ultrahigh-order modes, any minute variation of the refractive index and thickness in the guiding layer induced by the thermo-optic and thermal expansion effects will easily give rise to a dramatic change in the position of the reflected light. In our experiment, a series of Goos-Hänchen shifts are measured at temperatures varying from 50.0 °C to 51.2 °C with a step of 0.2 °C. The sensor exhibits a good linearity and a high resolution of approximately 5×10(-3) °C. Moreover, there is no need to employ any complicated optical equipment and servo techniques, since our transduction scheme is irrelevant to the light source fluctuation.
authors.affiliation: Department of Physics, The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, JiaoTong University, Shanghai 200240, China. xpwangphysics@gmail.com
authors.forename: Xianping
authors.initials: X
authors.lastname: Wang
authors.forename: Cheng
authors.initials: C
authors.lastname: Yin
authors.forename: Jingjing
authors.initials: J
authors.lastname: Sun
authors.forename: Honggen
authors.initials: H
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Maowu
authors.initials: M
authors.lastname: Ran
authors.forename: Zhuangqi
authors.initials: Z
authors.lastname: Cao