Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optomechanics I
Q 12.1: Talk
Monday, March 10, 2025, 17:00–17:15, HS I
Coupling an optically levitated nanoparticle to an ultrahigh-Q microtoroidal cavity — •Zijie Sheng1,2, Seyed Khalil Alavi1,2, Haneul Lee3, Hansuek Lee3,4, and Sungkun Hong1,2 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, DE — 2Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart, DE — 3Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea — 4Graduate School of Quantum Science and Technology, KAIST, Republic of Korea
Exploring the dynamics of an optically levitated dielectric nanoparticle and bringing its mechanical motion toward the quantum regime has been widely developed during the last few years. One promising way is to couple its motion to a high-finesse optical cavity. Here, we present a novel platform consisting of a conventional optical tweezer and a toroidal optical microcavity [1]. The optomechanical coupling between the particle and the cavity is established by placing the particle in the near field of the cavity. The significantly reduced mode volume allows us to achieve a 50-fold increase in the single photon optomechanical coupling compared to a conventional Fabry-Pérot cavity with macroscopic mirrors, while having ultralow loss of the cavity can allow us to potentially reach sideband resolved regime. We will present the recent progress of our experiment.
[1] S. Alavi, Z. Sheng, H. Lee, H. Lee, and S. Hong, ACS Photonics 2024 https://doi.org/10.1021/acsphotonics.4c01359
Keywords: microtoroidal cavity; levitation; nanoparticle; optomechanical coupling; optical tweezer