A wide-range temperature immune ultra-sensitive refractive index sensor using concatenated LPGs

TL;DR

This paper presents a novel refractive index sensor that maintains high sensitivity across a wide temperature range by using concatenated long-period gratings with optimized inter-grating materials and spacing.

Contribution

It introduces a temperature-immune design for ultra-sensitive refractive index sensing using concatenated LPGs with tailored inter-grating properties.

Findings

Achieves wide-range temperature insensitivity

Maintains high refractive-index sensitivity

Operates effectively around turn-around wavelength

Abstract

Compensating the temperature induced phase-changes of concatenated dual-resonance long-period-gratings by a suitably chosen inter-grating material and space we report wide-range temperature insensitivity along with extremely high refractive-index sensitivity, on either side of turn-around wavelength.