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 language | English |
|---|---|
| Article number | 044044 |
| Journal | Physical Review Applied |
| Volume | 11 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 15 Apr 2019 |
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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 journal › Article
TY - JOUR
T1 - Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28
AU - Bourhill, J.
AU - Goryachev, M.
AU - Creedon, D. L.
AU - Johnson, B. C.
AU - Jamieson, D. N.
AU - Tobar, M. E.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85064848426&partnerID=8YFLogxK
U2 - 10.1103/PhysRevApplied.11.044044
DO - 10.1103/PhysRevApplied.11.044044
M3 - Article
VL - 11
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 4
M1 - 044044
ER -