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arXiv · 1403.6486

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
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Abstract

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 cantilever-like mechanical resonances with a thermally-limited torque detection sensitivity of 1.2$\times 10^{-20} \text{N} \, \text{m}/\sqrt{\text{Hz}}$ in ambient conditions and 1.3$\times 10^{-21} \text{N} \, \text{m}/\sqrt{\text{Hz}}$ in low vacuum. Interference between optomechanical coupling mechanisms is observed to enhance detection sensitivity and generate a mechanical-mode-dependent optomechanical wavelength response.

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Marcelo Wu, Aaron C. Hryciw, Chris Healey, David P. Lake, Harishankar Jayakumar, Mark R. Freeman, John P. Davis, Paul E. Barclay. 2014-09-05. Dissipative and Dispersive Optomechanics in a Nanocavity Torque Sensor. https://doi.org/10.1103/physrevx.4.021052

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