期刊
PHYSICAL REVIEW X
卷 4, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.4.021052
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资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Innovates Technology Futures (AITF)
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 x 10(-20) Nm/root Hz in ambient conditions and 1.3 x 10(-21) Nm/root 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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