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Proceedings Paper

Torsional optomechanics and GHz rotation of an optically levitated nanoparticle in vacuum (Conference Presentation)
Author(s): Tongcang Li

Paper Abstract

Optically levitated nanoparticles in vacuum have great potentials in precision measurements, thermodynamics and macroscopic quantum mechanics. We have assembled and levitated silica nanodumbbells in high vacuum. With a circularly polarized laser, we have driven them to rotate beyond 1 GHz [J Ahn, et al. Phys. Rev. Lett., 121, 033603 (2018)]. With a linearly-polarized laser, we have observed its torsional vibration. Based on our experimental results, we proposed that this system can be used to study the coupling between the rotation of a nanoparticle and an electron spin [arXiv:1811.01641], and study the Casimir torque due to the angular momentum of quantum vacuum fluctuations [Phys. Rev. A, 96, 033843 (2017)]. With a levitated nanoparticle under drive, we also tested the differential fluctuation theorem and a generalized Jarzynski equality that is valid for arbitrary initial states [Phys. Rev. Lett. 120, 080602 (2018)]. Recently, we investigated the rotation of a levitated nanocluster to deepen our understanding of light-matter interaction.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 1108319 (9 September 2019); doi: 10.1117/12.2528245
Show Author Affiliations
Tongcang Li, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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