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 paper

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 - 14 May 2019
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
CountryAustralia
CityPerth
Period9/12/1813/12/18

Fingerprint

Whispering gallery modes
whispering gallery modes
Linewidth
Q factors
Resonators
Machining
resonators
Crystals
machining
Electron spin resonance spectroscopy
rods
Raman spectroscopy
Clocks
crystals
Permittivity
Single crystals
Annealing
Ions
Acids
clocks

Cite this

Tobar, M. E., Bourhill, J., Goryachev, M., Creedon, D., Johnson, B. C., & Jamieson, D. (2019). Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators: A Host for Narrow Linewidth Spin Ensembles. In 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018 (pp. 41-42). [8715244] (2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018). IEEE, Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/COMMAD.2018.8715244
Tobar, Michael E. ; Bourhill, Jeremy ; Goryachev, Maxim ; Creedon, Daniel ; Johnson, Brett C. ; Jamieson, David. / Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators : A Host for Narrow Linewidth Spin Ensembles. 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018. IEEE, Institute of Electrical and Electronics Engineers, 2019. pp. 41-42 (2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018).
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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.",
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Tobar, ME, Bourhill, J, Goryachev, M, Creedon, D, Johnson, BC & Jamieson, D 2019, Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators: A Host for Narrow Linewidth Spin Ensembles. in 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018., 8715244, 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018, IEEE, Institute of Electrical and Electronics Engineers, pp. 41-42, 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018, Perth, Australia, 9/12/18. https://doi.org/10.1109/COMMAD.2018.8715244

Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators : A Host for Narrow Linewidth Spin Ensembles. / Tobar, Michael E.; Bourhill, Jeremy; Goryachev, Maxim; Creedon, Daniel; Johnson, Brett C.; Jamieson, David.

2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018. IEEE, Institute of Electrical and Electronics Engineers, 2019. p. 41-42 8715244 (2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018).

Research output: Chapter in Book/Conference paperConference paper

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T3 - 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018

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EP - 42

BT - 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018

PB - IEEE, Institute of Electrical and Electronics Engineers

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Tobar ME, Bourhill J, Goryachev M, Creedon D, Johnson BC, Jamieson D. Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators: A Host for Narrow Linewidth Spin Ensembles. In 2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018. IEEE, Institute of Electrical and Electronics Engineers. 2019. p. 41-42. 8715244. (2018 Conference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2018). https://doi.org/10.1109/COMMAD.2018.8715244