Structural design and analysis of D-type elliptical open-loop photonic crystal fiber temperature sensor based on SPR
Yuxuan Yi, Zao Yi, Zigang Zhou, Hua Yang, Junqiao Wang, Chaojun Tang, Juan Deng, Boxun Li
Abstract
In arrange to progress the execution of temperature sensors, we investigate the plan, optimization, and application prospects of a circular D-type fiber optic temperature sensor. This elliptical D-type surface plasmon resonance (SPR) photonic crystal fiber (PCF) sensor is gold-plated on the circular side allegorical surface to upgrade the steadiness of the structure. The air gaps are organized in a certain normal design from the interior to the exterior, and the internal air gaps are organized in a hexagonal shape to make a central light-transmitting channel interfacing the fiber center mode and surface plasmon polariton (SPP) mode. The temperature-sensitive material polydimethylsiloxane (PDMS) is selected for its temperature- and refractive-index-dependent properties. The sensing characteristics are investigated using a finite element method (FEM)-based modal analysis in COMSOL, which effectively models the mode coupling between the core and surface plasmon modes. The refractive record affectability of the optimized sensor reaches 3907.1 nm/RIU. In the analysis of temperature sensitivity, separate calculations are performed for the low-temperature range and the ambient temperature range. It has a sensitivity of 7160 pm/°C in the ambient temperature range of −20 °C–0 °C and a sensitivity of 3130 pm/°C in the range of 0 °C–40 °C. In this paper, the proposed elliptical D-type PCF-SPR sensor holds significant potential for applications across various fields, including healthcare, engineering, transportation, and practical industrial production in society.