Dissipative and dispersive optomechanics in a nanocavity torque sensor

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DOIResolve DOI: http://doi.org/10.1103/PhysRevX.4.021052
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TypeArticle
Journal titlePhysical Review X
ISSN2160-3308
Volume4
Issue2
Article number21052-1-21052-11
SubjectPhysics; Ambient conditions; Coupling mechanism; Detection sensitivity; Dissipative coupling; Limited torques; Measurements of; Mechanical resonance; Wavelength response; Dispersion (waves)
AbstractDissipative and dispersive optomechanical couplings are experimentally observed in a photonic crystal split-beam nanocavity optimized for detecting nanoscale sources of torque. Dissipative coupling of up to approximately 500 MHz/nm and dispersive coupling of 2 GHz/nm enable measurements of sub-pg torsional and cantileverlike mechanical resonances with a thermally limited torque detection sensitivity of 1.2 × 10-20 Nm/√Hz in ambient conditions and 1.3 × 10-21 Nm=/√Hz in low vacuum. Interference between optomechanical coupling mechanisms is observed to enhance detection sensitivity and generate a mechanical-mode-dependent optomechanical wavelength response.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21274107
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Record identifier94e519b5-fe2a-43e5-aad1-d8d199ed0826
Record created2015-02-13
Record modified2016-05-09
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