Yamsiri, A; Duffy, D A; Machin, G; Sweeney, S J (2024) Active Photonic Thermometry using Quantum Well Heterostructures and Ring Resonators. AIP Conference Proceedings, 3230 (1). 110004

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Abstract

Photonic thermometry has to date mainly been based on passive silicon platforms, necessitating the use of external light sources and detection making the systems complex, expensive, and cumbersome. In this study, we investigate the potential of using III-V semiconductor alloys as the foundation for active photonic thermometry which offers the potential of embedding both the light source and detection functions on the same chip as the photonic temperature sensor. In particular, we focus on the use of quantum heterostructures based on the well-established indium gallium arsenide phosphide (InGaAsP)/InP alloys which also enable operation at the standard (telecoms) wavelengths (around 1550 nm). This initial study focuses on firstly establishing the temperature dependence of the III-V semiconductors’ refractive indices using spectroscopic ellipsometry (SE) measurements, and secondly, modelling of the resonator functionality for temperature sensing. We find that the variation in changes of the refractive index with respect to the temperature, (dn/dT) ×10-4 (/°C), of the indium phosphide (InP), gallium arsenide (GaAs), gallium phosphide (GaP), and indium arsenide (InAs) binaries are 1.92 ± 0.06, 2.40 ± 0.06, 1.23 ± 0.02 and, 1.9 ± 0.2, respectively at the wavelength of 1550 nm within the temperature range from 25°C to 200 °C. Finite Difference Time Domain (FDTD) optical modelling of InGaAsP/InP quantum well heterostructures and ring resonators using the refractive index measurement data demonstrates the potential of using this platform for use in active photonic thermometry.

Item Type:	Article
Keywords:	thermometry, ring resonators, relative primary thermometry
Subjects:	Engineering Measurements > Thermal
Divisions:	Materials and Mechanical Metrology
Identification number/DOI:	10.1063/5.0234129
Last Modified:	12 May 2025 14:02
URI:	https://eprintspublications.npl.co.uk/id/eprint/10160