Cascaded plastic optical fiber based SPR sensor for simultaneous measurement of refractive index and temperature

Chuanxin Teng; Xinjing Li; Ming Chen; Shijie Deng; Hongchang Deng; Minmin Xue; Libo Yuan; Rui Min; Xiaosong Fu; Xuehao Hu

doi:10.1364/BOE.515320

Cascaded plastic optical fiber based SPR sensor for simultaneous measurement of refractive index and temperature

Biomed Opt Express. 2024 Jan 16;15(2):793-801. doi: 10.1364/BOE.515320. eCollection 2024 Feb 1.

Authors

Chuanxin Teng¹, Xinjing Li¹, Ming Chen¹, Shijie Deng¹, Hongchang Deng¹, Minmin Xue¹, Libo Yuan¹, Rui Min², Xiaosong Fu³, Xuehao Hu⁴

Affiliations

¹ Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China.
² Center for Cognition and Neuroergonomics, State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Zhuhai 519087, China.
³ Beijing Feibo Technology Co., LTD, Beijing 100016, China.
⁴ Department of Electromagnetism and Telecommunication, University of Mons, 7000 Mons, Belgium.

Abstract

A cascaded side-polish plastic optical fiber (POF) and FONTEX optical fiber based surface plasmon resonance (SPR) sensor is proposed for simultaneous measurement of refractive index (RI) and temperature. The side-polish POF and FONTEX optical fiber are connected by using the UV glue in a Teflon plastic tube. The SPR phenomenon can be excited at both of the side-polish region and the FONTEX fiber cladding. The polydimethylsiloxane (PDMS) is coated on the side-polish POF to get a temperature sensing channel. Due to the low RI sensitivity of the FONTEX optical fiber, the cascaded fiber sensor can obtain a broader RI measurement range with a low crosstalk. An RI sensitivity of 700 nm/RIU in the RI measurement range of 1.335-1.39 and a temperature sensitivity of -1.02 nm/°C measured in deionized water with a range of 20-60 °C are obtained. In addition, the cascaded POF based SPR sensor has potential application prospects in the field of biochemical sensing.