Dissipative and Dispersive Optomechanics in a Nanocavity Torque Sensor

Dissipative and Dispersive Optomechanics in a Nanocavity Torque Sensor

Dissipative 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 to...

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Bibliographic Details
Published in:Physical review. X Vol. 4; no. 2; p. 021052
Main Authors: Wu, Marcelo, Hryciw, Aaron C., Healey, Chris, Lake, David P., Jayakumar, Harishankar, Freeman, Mark R., Davis, John P., Barclay, Paul E.
Format: Journal Article
Language:English
Published: College Park American Physical Society 01-06-2014
Subjects:
Amplification
Cavity resonators
Couplings
Displacement
Light
Low temperature
Low vacuum
Magnetic materials
Mechanical devices
Optical communication
Optical fibers
Optical resonance
Optical resonators
Optimization
Opto-mechanics
Photonic crystals
Sensitivity enhancement
Sensors
Torquemeters
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Summary:Dissipative 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 1.2×10−20Nm/Hz in ambient conditions and 1.3×10−21Nm/Hz in low vacuum. Interference between optomechanical coupling mechanisms is observed to enhance detection sensitivity and generate a mechanical-mode-dependent optomechanical wavelength response.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.4.021052