Authors: Smith, JA; Hill, P; Klitis, C; Weituschat, L; Postigo, PA; Sorel, M; Dawson, MD; Strain, MJ
Article.
Opt. Express. vol: 29. page: 1094-4087.
Date: AUG 30. 2021.
Doi: 10.1364/OE.433607.
Abstract:
We demonstrate a dual-material integrated photonic thermometer, fabricated by high accuracy micro-transfer printing. A freestanding diamond micro-disk resonator is printed in close proximity to a gallium nitride on a sapphire racetrack resonator, and respective loaded Q factors of 9.1 x 10(4) and 2.9 x 10(4) are measured. We show that by using two independent wide-bandgap materials, tracking the thermally induced shifts in multiple resonances, and using optimized curve fitting tools the measurement error can be reduced to 9.2 mK. Finally, for the GaN, in a continuous acquisition measurement we record an improvement in minimum Allan variance, occurring at an averaging time four times greater than a comparative silicon device, indicating better performance over longer time scales. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License..
