Nano-Kelvin thermometry and temperature control: Beyond the thermal noise limit

Weng, Wenie, Anstie, James D., Stace, Thomas M., Campbell, Geoff, Baynes, Fred N. and Luiten, Andre N. (2014) Nano-Kelvin thermometry and temperature control: Beyond the thermal noise limit. Physical Review Letters, 112 16: . doi:10.1103/PhysRevLett.112.160801

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Author Weng, Wenie
Anstie, James D.
Stace, Thomas M.
Campbell, Geoff
Baynes, Fred N.
Luiten, Andre N.
Title Nano-Kelvin thermometry and temperature control: Beyond the thermal noise limit
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2014-04-21
Year available 2014
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.112.160801
Open Access Status File (Publisher version)
Volume 112
Issue 16
Total pages 5
Place of publication College Park, MD United States
Publisher American Physical Society
Language eng
Abstract We demonstrate thermometry with a resolution of 80nK/Hz using an isotropic crystalline whispering-gallery mode resonator based on a dichroic dual-mode technique. We simultaneously excite two modes that have a mode frequency ratio that is very close to two (±0.3ppm). The wavelength and temperature dependence of the refractive index means that the frequency difference between these modes is an ultrasensitive proxy of the resonator temperature. This approach to temperature sensing automatically suppresses sensitivity to thermal expansion and vibrationally induced changes of the resonator. We also demonstrate active suppression of temperature fluctuations in the resonator by controlling the intensity of the driving laser. The residual temperature fluctuations are shown to be below the limits set by fundamental thermodynamic fluctuations of the resonator material.
Keyword Physics, Multidisciplinary
Physics
PHYSICS, MULTIDISCIPLINARY
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0877938
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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