High precision integrated photonic thermometry enabled by a transfer printed diamond resonator on GaN waveguide chip
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-08-18 |
| Journal | Optics Express |
| Authors | Jack A. Smith, P. Hill, Charalambos Klitis, Lukas Weituschat, P. A. Postigo |
| Institutions | Consejo Superior de Investigaciones CientĆficas, University of Strathclyde |
| Citations | 6 |
Abstract
Section titled āAbstractāWe 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 Ć 10 4 and 2.9 Ć 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.