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تسجيل مستخدم جديدDissipative and Dispersive Optomechanics in a Nanocavity Torque Sensor
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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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