Design of Surface Plasmon Resonance-Based D-Type Double Open-Loop Channels PCF for Temperature Sensing

• Published in: Sensors (Basel, Switzerland) Vol. 23; no. 17; p. 7569
• Main Authors: Gao, Shuangyan, Wei, Kaihua, Yang, Hua, Tang, Yongjian, Yi, Zao, Tang, Chaojun, Tang, Bin, Yi, Yougen, Wu, Pinghui
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 31.08.2023; MDPI
• Subjects: Core-Metal-Analytes; double open-loop channels; Electric fields; Equipment and supplies; Fiber optics; Sensors; Spectrum analysis; surface plasmon resonance; temperature sensing; China; Core-Metal-Analytes; double open-loop channels; surface plasmon resonance; temperature sensing
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s23177569

Here, we document a D-type double open-loop channel floor plasmon resonance (SPR) photonic crystal fiber (PCF) for temperature sensing. The grooves are designed on the polished surfaces of the pinnacle and backside of the PCF and covered with a gold (Au) film, and stomata are distributed around the PCF core in a progressive, periodic arrangement. Two air holes between the Au membrane and the PCF core are designed to shape a leakage window, which no longer solely averts the outward diffusion of Y-polarized (Y-POL) core mode energy, but also sets off its coupling with the Au movie from the leakage window. This SPR-PCF sensor uses the temperature-sensitive property of Polydimethylsiloxane (PDMS) to reap the motive of temperature sensing. Our lookup effects point out that these SPR-PCF sensors have a temperature sensitivity of up to 3757 pm/°C when the temperature varies from 5 °C to 45 °C. In addition, the maximum refractive index sensitivity (RIS) of the SPR-PCF sensor is as excessive as 4847 nm/RIU. These proposed SPR-PCF temperature sensors have an easy nanostructure and proper sensing performance, which now not solely improve the overall sensing performance of small-diameter fiber optic temperature sensors, but also have vast application prospects in geo-logical exploration, biological monitoring, and meteorological prediction due to their remarkable RIS and exclusive nanostructure.