4 research outputs found
Pulsed excitation dynamics of an optomechanical crystal resonator near its quantum ground-state of motion
Using pulsed optical excitation and read-out along with single phonon
counting techniques, we measure the transient back-action, heating, and damping
dynamics of a nanoscale silicon optomechanical crystal cavity mounted in a
dilution refrigerator at a base temperature of 11mK. In addition to observing a
slow (~740ns) turn-on time for the optical-absorption-induced hot phonon bath,
we measure for the 5.6GHz `breathing' acoustic mode of the cavity an initial
phonon occupancy as low as 0.021 +- 0.007 (mode temperature = 70mK) and an
intrinsic mechanical decay rate of 328 +- 14 Hz (mechanical Q-factor =
1.7x10^7). These measurements demonstrate the feasibility of using short pulsed
measurements for a variety of quantum optomechanical applications despite the
presence of steady-state optical heating.Comment: 16 pages, 6 figure
Waveguide-Coupled Superconducting Nanowire Single-Photon Detectors
We have demonstrated WSi-based superconducting nanowire single-photon detectors coupled to SiN_x waveguides with integrated ring resonators. This photonics platform enables the implementation of robust and efficient photon-counting detectors with fine spectral resolution near 1550 nm
Diamond optomechanical crystals in the resolved-sideband regime
We demonstrate diamond optomechanical crystals (OMCs), which support a similar to 6 GHz mechanical cavity coupled to a co-resonant similar to 200 THz photon field. Diamond OMCs are optically driven to a cooperativity >1, highlighted by observed 'phonon lasing'
Diamond optomechanical crystals in the resolved-sideband regime
We demonstrate diamond optomechanical crystals (OMCs), which support a similar to 6 GHz mechanical cavity coupled to a co-resonant similar to 200 THz photon field. Diamond OMCs are optically driven to a cooperativity >1, highlighted by observed 'phonon lasing'