Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Optomechanics
Q 55.3: Vortrag
Donnerstag, 5. März 2026, 15:00–15:15, P 2
Coherent scattering of an optically levitated nanoparticle to an ultrahigh-Q microtoroidal cavity — •Zijie Sheng1, Seyed Khalil Alavi1, Haneul Lee2, Hansuek Lee2,3, and Sungkun Hong1 — 1Institute Institute for Functional Matter and Quantum Technologies and Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart, DE — 2Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea — 3Graduate School of Quantum Science and Technology, KAIST, Republic of Korea
Optically levitated dielectric nanoparticle offers a versatile platform for studying quantum physics beyond microscopic domain. Coupling its mechanical motion to the optical cavity enables the investigation of diverse optomechanical phenomena, which rely strongly on the strength of optomechanical coupling. An effective approach to enhancing the coupling is cavity-enhanced coherent scattering, where the cavity mode is driven by photon coherently scattered from the nanoparticle. Using this scheme, quantum ground state cooling has been achieved with the conventional Fabry-Pérot mirror cavity in weak coupling regime. Here we present the coherent scattering of the nanoparticle trapped by optical tweezer to a silica toroidal optical microcavity, where the significantly reduced mode volume enhances the optomechanical coupling, placing our platform in the ultrastrong coupling regime (g ≫ ω). We will report the key findings in this regime, together with the significant anomalous cooling to be explained.
Keywords: cavity; levitation; nanoparticle; optomechanical coupling; coherent scattering