"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Ultra-broad mid-infrared plasmonic sensor based on soft-glass photonic crystal fiber for temperature detection

JIAN-FEI LIAO1,2,* , HONG-HUANG XU1, LIN-XI LIU1, YING GENG1

Affiliation

  1. School of Mechanical and Electrical Engineering, Wuyi University, Wuyishan 354300, China
  2. The Key Laboratory for Agricultural Machinery Intelligent Control and Manufacturing of Fujian Education Institutions, Wuyi University, Wuyishan 354300, China

Abstract

A plasmonic sensor utilizing a soft-glass photonic crystal fiber (PCF) with two liquid cores is developed for temperature sensing over a -50–40 °C range. This sensor incorporates a central air hole coated with a thin gold film to achieve surface plasmon resonance (SPR) in the mid-infrared (MIR) spectral range. A comprehensive theoretical analysis of its detection properties indicates that the sensor can perform single-resonance sensing across the MIR range of 3.0-3.4 μm while accommodating temperature variations from -50 to 40 °C. It demonstrates a peak sensitivity of 6.30 nm/°C and a high temperature resolution of 0.0159 °C. Furthermore, within the range of -50–40 °C, it exhibits an average sensitivity of 3.6958 nm/°C and achieves a high linearity coefficient of 0.9963. As a result, this study opens new possibilities for applying PCF-based SPR technology to MIR temperature sensing..

Keywords

Photonic crystal fiber, Surface plasmon resonance, Temperature sensor, Mid-infrared.

Submitted at: Nov. 26, 2025
Accepted at: Aug. 4, 2026

Citation

JIAN-FEI LIAO, HONG-HUANG XU, LIN-XI LIU, YING GENG, Ultra-broad mid-infrared plasmonic sensor based on soft-glass photonic crystal fiber for temperature detection, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 7-8, pp. 306-313 (2026)