Structural design and analysis of D-type elliptical open-loop photonic crystal fiber temperature sensor based on SPR

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.