Thermalization properties at mK temperatures of a nanoscale optomechanical resonator with acoustic-bandgap shield

Author(s)
Sean M. Meenehan, Justin D. Cohen, Simon Gröblacher, Jeff T. Hill, Amir H. Safavi-Naeini, Markus Aspelmeyer, Oskar Painter
Abstract

Optical measurements of a nanoscale silicon optomechanical crystal cavity with a mechanical resonance frequency of 3.6GHz are performed at sub-kelvin temperatures. We infer optical-absorption-induced heating and damping of the mechanical resonator from measurements of phonon occupancy and motional sideband asymmetry. At the lowest probe power and lowest fridge temperature (10mK), the localized mechanical resonance is found to couple at a rate of 400Hz (Q=9x10^6) to a thermal bath of temperature 270mK. These measurements indicate that silicon optomechanical crystals cooled to millikelvin temperatures should be suitable for a variety of experiments involving coherent coupling between photons and phonons at the single quanta level.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
California Institute of Technology (Caltech)
No. of pages
11
DOI
https://doi.org/10.48550/arXiv.1403.3703
Publication date
03-2014
Austrian Fields of Science 2012
103025 Quantum mechanics, 103021 Optics
Keywords
Portal url
https://ucrisportal.univie.ac.at/en/publications/4db6a6be-14ad-4a54-97b3-9eed13dbee04