Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators: A Host for Narrow Linewidth Spin Ensembles

Michael E. Tobar, Jeremy Bourhill, Maxim Goryachev, Daniel Creedon, Brett C. Johnson, David Jamieson

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

Single crystal isotopically pure 28Si cylindrical Whispering Gallery (WG) mode resonators have been machined from a rod of isotopically pure crystal. Before machining, the rod was loaded into a cavity with the best Bragg confined modes exhibiting Q-factors above a million for frequencies between 10 and 15 GHz. Electron Spin Resonance spectroscopy revealed a very narrow linewidth spin transition, with g-factor of 1.995±0.008. Analysis determined an upper limit to the linewidth of 7 kHz and a concentration of less than 1011 spins/cm3 (10 parts per trillion). After machining into WG mode resonators, the measured frequencies of the fundamental mode families were used to determine the relative permittivity of the material near 4 K and 20 mK to be 11.488±0.024, with the precision limited only by the dimensional accuracy of the resonator. However, the Q-factors were degraded to below 40,000. Raman spectroscopy revealed strain induced broadening on the radial surface of the crystal as a result of the machining. After an acid clean and etch, followed by annealing, the surface damage was repaired. Subsequently, high Q-factors were also restored. The next step will be to purposefully implant ions to try and realise narrow linewidth spin ensembles with clock transitions, which will couple to high-Q WG modes inside the crystal.

Original languageEnglish
Title of host publication2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages41-42
Number of pages2
ISBN (Electronic)9781538695241
DOIs
Publication statusPublished - 2 Jul 2018
Event2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018 - Perth, Australia
Duration: 9 Dec 201813 Dec 2018

Publication series

Name2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018

Conference

Conference2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018
Country/TerritoryAustralia
CityPerth
Period9/12/1813/12/18

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