title: An Exposed-Core Grapefruit Fibers Based Surface Plasmon Resonance Sensor.
abstract: To solve the problem of air hole coating and analyte filling in microstructured optical fiber-based surface plasmon resonance (SPR) sensors, we designed an exposed-core grapefruit fiber (EC-GFs)-based SPR sensor. The exposed section of the EC-GF is coated with a SPR, supporting thin silver film, which can sense the analyte in the external environment. The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities. A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained. The silver layer thickness, which may affect the sensing performance, is also discussed. This work can provide a reference for developing a high sensitivity, real-time, fast-response, and distributed SPR RI sensor.
authors.affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. yangxianchao@tju.edu.cn.
authors.forename: Xianchao
authors.initials: X
authors.lastname: Yang
authors.affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. luying@tju.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Lu
authors.affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. wo3336903@126.com.
authors.forename: Mintuo
authors.initials: M
authors.lastname: Wang
authors.affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. jqyao@tju.edu.cn.
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yao
keywords: exposed-core grapefruit fibers; silver layer thickness; surface plasmon resonance; x- and y-polarized