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Torsional optomechanics of a levitated nonspherical nanoparticle

zqyin 添加于 2016-5-17 09:03 | 1354 次阅读 | 0 个评论

作者
Hoang TM, Ma Y, Ahn J, Bang J, Robicheaux F, Yin Z-Q, Li T
摘要
An optically levitated nanoparticle in vacuum is a paradigm optomechanical system for sensing and studying macroscopic quantum mechanics. While its center-of-mass motion has been investigated intensively, its torsional vibration has only been studied theoretically in limited cases. Here we report the first experimental observation of the torsional vibration of an optically levitated nonspherical nanoparticle in vacuum. We achieve this by utilizing the coupling between the spin angular momentum of photons and the torsional vibration of a nonspherical nanoparticle whose polarizability is a tensor. The torsional vibration frequency can be one order of magnitude higher than its center-of-mass motion frequency, which is promising for ground state cooling. With an ellipsoidal model, we propose a simple yet novel scheme to achieve ground state cooling of its torsional vibration with a linearly-polarized Gaussian cavity mode. A levitated nonspherical nanoparticle in vacuum will also be an ultrasensitive nanoscale torsion balance with a torque detection sensitivity on the order of $10^{-29} ~mathrm{N}cdot mathrm{m}/sqrt{mathrm{ Hz}}$ under realistic conditions.
详细资料
- 关键词: quant-ph; cond-mat.mes-hall; physics.optics
- 文献种类: Manual Script
- 期卷页: 2016年
- 日期: 2016-5-13
- 发布方式: arXiv e-prints
- 备注:arXiv:1605.03990v1
学科领域自然科学 » 物理学
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