Related papers: Near-field GHz rotation and sensing with an optically levitated nanodumbbell

Near-field GHz rotation and sensing with an optically levitated nanodumbbell

URL: http://arxiv.org/abs/2301.10868v1
Date: Wed, 25 Jan 2023 23:30:21 GMT
Title: Near-field GHz rotation and sensing with an optically levitated nanodumbbell
Authors: Peng Ju, Yuanbin Jin, Kunhong Shen, Yao Duan, Zhujing Xu, Xingyu Gao, Xinjie Ni, Tongcang Li
Abstract summary: We optically levitate a silica nanodumbbell in a vacuum at about 430 nm away from a sapphire surface and drive it to rotate at GHz frequencies. The relative linear speed between the tip of the nanodumbbell and the surface reaches 1.4 km/s at a sub-micrometer separation. Our numerical simulation shows it is promising to detect the Casimir torque between a nanodumbbell and a nanograting.
Score: 2.3797170434560484
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: A levitated non-spherical nanoparticle in a vacuum is ideal for studying quantum rotations and is an extremely sensitive torque and force detector. It has been proposed to probe fundamental particle-surface interactions such as the Casimir torque and the rotational quantum vacuum friction, which require it to be driven to rotate near a surface at sub-micrometer separations. Here, we optically levitate a silica nanodumbbell in a vacuum at about 430 nm away from a sapphire surface and drive it to rotate at GHz frequencies. The relative linear speed between the tip of the nanodumbbell and the surface reaches 1.4 km/s at a sub-micrometer separation. The rotating nanodumbbell near the surface demonstrates a torque sensitivity of $(5.0 \pm 1.1) \times 10^{-26} {\rm NmHz}^{-1/2}$ at room temperature. Moreover, we levitate a nanodumbbell near a gold nanograting and use it to probe the near-field intensity distribution beyond the optical diffraction limit. Our numerical simulation shows it is promising to detect the Casimir torque between a nanodumbbell and a nanograting.

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