Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28

J. Bourhill, M. Goryachev, D. L. Creedon, B. C. Johnson, D. N. Jamieson, M. E. Tobar

Research output: Contribution to journalArticle

Abstract

Whispering-gallery-(WG) mode resonators are machined from a boule of single-crystal isotopically pure silicon-28. Before machining, the as-grown rod is measured in a cavity, with the best Bragg confined modes exhibiting microwave Q factors on the order of a million for frequencies between 10 and 15 GHz. After machining the rod into smaller cylindrical WG-mode resonators, the frequencies of the fundamental mode families are used to determine the relative permittivity of the material to be 11.488±0.024 near 4 K, with the precision limited only by the dimensional accuracy of the resonator. However, the machining degraded the Q factors to below 4×104. Raman spectroscopy is used to optimize postmachining surface treatments to restore high-Q-factors. This is an enabling step for the use of such resonators for hybrid quantum systems and frequency-conversion applications, as silicon-28 also has very low phonon losses, can host very narrow linewidth spin ensembles, and is a material commonly used in optical applications.

Original languageEnglish
Article number044044
JournalPhysical Review Applied
Volume11
Issue number4
DOIs
Publication statusPublished - 15 Apr 2019

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whispering gallery modes
Q factors
resonators
machining
silicon
rods
frequency converters
surface treatment
Raman spectroscopy
permittivity
microwaves
cavities
single crystals

Cite this

Bourhill, J. ; Goryachev, M. ; Creedon, D. L. ; Johnson, B. C. ; Jamieson, D. N. ; Tobar, M. E. / Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28. In: Physical Review Applied. 2019 ; Vol. 11, No. 4.
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Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28. / Bourhill, J.; Goryachev, M.; Creedon, D. L.; Johnson, B. C.; Jamieson, D. N.; Tobar, M. E.

In: Physical Review Applied, Vol. 11, No. 4, 044044, 15.04.2019.

Research output: Contribution to journalArticle

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