High precision integrated photonic thermometry enabled by a transfer printed diamond resonator on GaN waveguide chip

Smith, Jack A. and Hill, Paul and Klitis, Charalambos and Weituschat, Lukas and Postigo, Pablo A. and Sorel, Marc and Dawson, Martin D. and Strain, Michael J. (2021) High precision integrated photonic thermometry enabled by a transfer printed diamond resonator on GaN waveguide chip. Optics Express, 29 (18). pp. 29095-29106. ISSN 1094-4087 (https://doi.org/10.1364/OE.433607)

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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 × 104 and 2.9 × 104 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.

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