Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 55: Optomechanics
Q 55.1: Talk
Thursday, March 5, 2026, 14:30–14:45, P 2
Phase-adaptive cooling of fringe-trapped nanoparticles in hollow-core fiber — Soumya Chakraborty1,2, •Gordon K. L. Wong1, Pardeep Kumar1, Hyunjun Nam1,2, Claudiu Genes3,1, and Nicolas Y. Joly2,1 — 1Max Planck Institute for the Science of Light, Staudtstrasse 2, D-91058 Erlangen, Germany — 2Department of Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstrasse 7, D-91058 Erlangen, Germany — 3TU Darmstadt, Institute for Applied Physics, Hochschulstrasse 4A, D-64289 Darmstadt, Germany
Freezing thermally driven center-of-mass (CoM) motion is essential for accessing quantum effects in macroscopic systems. Here, we experimentally demonstrate a novel phase-adaptive feedback cooling of optically levitated silica nanoparticles inside a hollow-core photonic crystal fiber at room temperature. The particle is tweezed in a standing-wave potential formed by two co-linearly polarized counterpropagating fiber-guided modes. Its axial CoM motion is cooled by adjusting the relative optical phase of the modes as a response to the particle's momentum, generating a dissipative force without recoil heating. The method is applicable to neutral particles. Using this approach, the CoM temperature of a 195 nm silica particle is reduced to 58.6 K at 0.5 mbar, while for a 400 nm particle the temperature reaches 11 K at the same pressure. A stochastic analytical model accurately reproduces the experimental results. This approach enables long-range, coherent control of mesoscopic particles in fiber-based platforms for future quantum applications.
Keywords: Optical levitation; Phase-adaptive feedback cooling; Hollow-core fibers; Optomechanics