Highly Sensitive Dual-Core Photonic Metal Fiber

TL;DR

This paper introduces a novel all-solid dual-core metal fiber with filled liquids for highly sensitive temperature sensing, demonstrating significant sensitivity and pressure insensitivity through numerical simulations.

Contribution

The study presents a new all-solid dual-core fiber design with liquid filling for enhanced temperature sensing, achieving high sensitivity and pressure insensitivity.

Findings

Sensitivity up to -15 nm/C within 0-70°C

Short fiber length of 1.6 mm suffices for high sensitivity

Insensitivity to hydrostatic pressure

Abstract

In this study, we propose an all-solid cladding dual-core metal fiber (DC-MF) filled with toluene and ethanol for temperature sensing applications. Instead of using air holes in the cladding region, we employ fluorine doped silica glass to form an all-solid cladding. By selectively filling toluene and ethanol into three air holes near the core region, we investigate the temperature sensing characteristics numerically. Simulation results demonstrate that the average sensitivity of the temperature sensing can reach -11.64 and -7.41 nm/C within the temperature ranges of 0 to 70 C and -80 to 0 C, respectively, even with a short DC-MF length of 1.6 mm. The maximum sensitivity in the considered temperature ranges can reach up to -15 and -9 nm/C, respectively. Furthermore, the proposed temperature sensor exhibits insensitivity to hydrostatic pressure.