新科学想法 › 文献管理 › 浏览文献

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

zqyin 添加于 2023-1-27 17:21 | 561 次阅读 | 0 个评论

作者
Ju P, Jin Y, Shen K, Duan Y, Xu Z, Gao X, Ni X, Li T
摘要
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.
详细资料
- 关键词: quant-ph; physics.optics
- 文献种类:手稿
- 期卷页: 2023年
- 日期: 2023-1-26
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/2301.10868v1
相关链接 URL