title: Fabrication of a compact reflective long-period grating sensor with a cladding-mode-selective fiber end-face mirror.
abstract: A long-period grating (LPG) based compact optical fiber sensor working in reflection mode is demonstrated. A technique to make a mirror on the cladding region of a fiber end-face to reflect only the cladding modes was realized by growing a polymeric microtip on the core region of the fiber end-face, by photopolymerization, followed by coating the fiber end-face with an aluminum film. Using the cladding-mode-selective fiber end-face mirror, the transmission spectrum of the LPG was "inverted" and reflected. Preliminary results of using the sensor to measure the refractive index of glycerol/water solutions were successfully demonstrated.
authors.affiliation: Center for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instruments, Zhejiang University, Hangzhou 310058, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Jiang
authors.forename: A Ping
authors.initials: AP
authors.lastname: Zhang
authors.forename: Yang-Chun
authors.initials: YC
authors.lastname: Wang
authors.forename: Hwa-Yaw
authors.initials: HY
authors.lastname: Tam
authors.forename: Sailing
authors.initials: S
authors.lastname: He
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007909:Lenses; D010783:Photometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers