SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 48: Optomechanics II
Q 48.3: Talk
Thursday, March 9, 2023, 11:45–12:00, E214
A hybrid optomechanical system of an optically levitated nanoparticle and an optical microcavity in a resolved sideband regime — •Zijie Sheng1,2, Seyed Khalil Alavi1,2, Harald Giessen3, Haneul Lee4, Hansuek Lee4, and Sungkun Hong1,2 — 1Institute for Functional Matter and Quantum Technologies, Universität Stuttgart, 70569 Stuttgart, DE — 2Center for Integrated Quantum Science and Technology, Universität Stuttgart, 70569 Stuttgart, DE — 34th Physics Institute, Universität Stuttgart, 70569 Stuttgart, DE — 4Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
An optically levitated dielectric nanoparticle coupled to an optical cavity has recently emerged as an optomechanical system with unique features that allow for quantum experiments at room temperature. The field has shown rapid progress in the past few years, including cooling of the particle’s motion down to the ground state, achieved with a conventional Fabry-Pérot optical cavity in a resolved sideband regime. We present a new type of optomechanical system comprising a nanoparticle in an optical tweezer and a monolithic optical microcavity in a resolved sideband regime. We use a silica microtoroid as an optical cavity with a Q factor of up to 108. The optomechanical coupling is realized through the evanescent field when the particle is near the microtoroid. At a few hundred nanometers from the surface, the coupling of up to tens of kHz can be achieved, five orders of magnitude larger than the previous work with a bulk optical cavity. We discuss our progress toward attaining strong quantum cooperativity.