Optical read out and feedback cooling of a nanostring optomechanical cavity
Optical measurement of the motion of a 940 kHz mechanical resonance of a silicon nitride nanostring resonator is demonstrated with a read out noise imprecision reaching 37 dB below that of the resonator's zero-point fluctuations. Via intensity modulation of the optical probe laser, radiation pr...
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| description | Optical measurement of the motion of a 940 kHz mechanical resonance of a silicon nitride nanostring resonator is demonstrated with a read out noise imprecision reaching 37 dB below that of the resonator's zero-point fluctuations. Via intensity modulation of the optical probe laser, radiation pressure feedback is used to cool and damp the mechanical mode from an initial room temperature occupancy of \(\bar{n}_{b} = 6.5 \times 10^6\) (\(T_{b}=295\)K) down to a phonon occupation of \(\langle n \rangle = 66 \pm 10\), representing a mode temperature of \(T_{m} \approx 3\)mK. The five decades of cooling is enabled by the system's large single-photon cooperativity \((C_{1} = 4)\) and high quantum efficiency of optical motion detection (\(\eta_{t} = 0.27\)). |
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Via intensity modulation of the optical probe laser, radiation pressure feedback is used to cool and damp the mechanical mode from an initial room temperature occupancy of \(\bar{n}_{b} = 6.5 \times 10^6\) (\(T_{b}=295\)K) down to a phonon occupation of \(\langle n \rangle = 66 \pm 10\), representing a mode temperature of \(T_{m} \approx 3\)mK. The five decades of cooling is enabled by the system's large single-photon cooperativity \((C_{1} = 4)\) and high quantum efficiency of optical motion detection (\(\eta_{t} = 0.27\)).</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Feedback ; Motion perception ; Noise levels ; Occupancy ; Optical measurement ; Quantum efficiency ; Radiation pressure ; Resonators ; Silicon nitride ; Variations</subject><ispartof>arXiv.org, 2015-06</ispartof><rights>2015. 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Via intensity modulation of the optical probe laser, radiation pressure feedback is used to cool and damp the mechanical mode from an initial room temperature occupancy of \(\bar{n}_{b} = 6.5 \times 10^6\) (\(T_{b}=295\)K) down to a phonon occupation of \(\langle n \rangle = 66 \pm 10\), representing a mode temperature of \(T_{m} \approx 3\)mK. The five decades of cooling is enabled by the system's large single-photon cooperativity \((C_{1} = 4)\) and high quantum efficiency of optical motion detection (\(\eta_{t} = 0.27\)).</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record> |
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| subjects | Feedback Motion perception Noise levels Occupancy Optical measurement Quantum efficiency Radiation pressure Resonators Silicon nitride Variations |
| title | Optical read out and feedback cooling of a nanostring optomechanical cavity |
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