Dissipative and dispersive optomechanics in a nanocavity torque sensor

Marcelo Wu, Aaron C. Hryciw, Chris Healey, David P. Lake, Harishankar Jayakumar, Mark R. Freeman, John P. Davis, Paul E. Barclay

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


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 × 10-20 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.

Original languageEnglish (US)
Article number021052
JournalPhysical Review X
Issue number2
StatePublished - 2014
Externally publishedYes


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