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

Jack A. Smith, Paul Hill, Charalambos Klitis, Lukas Weituschat, Pablo A. Postigo, Marc Sorel, Martin D. Dawson, Michael J. Strain

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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.

Original languageEnglish
Pages (from-to)29095-29106
Number of pages12
JournalOptics Express
Volume29
Issue number18
DOIs
Publication statusPublished - 25 Aug 2021

Keywords

  • integrated photonic thermometer
  • micro-transfer printing
  • performance

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