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- Title
Cavity Optomechanical Bistability with an Ultrahigh Reflectivity Photonic Crystal Membrane.
- Authors
Zhou, Feng; Bao, Yiliang; Gorman, Jason J.; Lawall, John R.
- Abstract
Photonic crystal (PhC) membranes patterned with sub‐wavelength periods offer a unique combination of high reflectivity, low mass, and high mechanical quality factor. Using a PhC membrane as one mirror of a Fabry–Perot cavity, a finesse as high as F=35000(500)$F=35\,000(500)$ is demonstrated, corresponding to a record high PhC reflectivity of R=0.999835(6)$R=0.999835(6)$ and an optical quality factor of Qopt≈109$Q_{\text{opt}}\approx 10^9$. The fundamental mechanical frequency is 426 kHz, more than twice the optical linewidth, placing it firmly in the resolved‐sideband regime required for ground‐state optical cooling. The mechanical quality factor in vacuum is Q=1.1(1)×106$Q=1.1(1)\times 10^6$, allowing values of the single‐photon cooperativity as high as C0=6.6×10−3${\cal C}_0=6.6\times 10^{-3}$. Optomechanical bistability is easily observed as hysteresis in the cavity transmission. As the input power is raised well beyond the bistability threshold, dynamical backaction induces strong mechanical oscillation above 1 MHz, even in the presence of air damping. This platform will facilitate advances in optomechanics, precision sensing, and applications of optomechanically‐induced bistability.
- Subjects
PHOTONIC crystals; QUALITY factor; MECHANICAL oscillations; OPTOMECHANICS
- Publication
Laser & Photonics Reviews, 2023, Vol 17, Issue 10, p1
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.202300008