Near-field GHz rotation and sensing with an optically levitated nanodumbbell
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866929385836118016 |
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| author | Ju, Peng Jin, Yuanbin Shen, Kunhong Duan, Yao Xu, Zhujing Gao, Xingyu Ni, Xinjie Li, Tongcang |
| author_facet | Ju, Peng Jin, Yuanbin Shen, Kunhong Duan, Yao Xu, Zhujing Gao, Xingyu Ni, Xinjie Li, Tongcang |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_10868 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Near-field GHz rotation and sensing with an optically levitated nanodumbbell Ju, Peng Jin, Yuanbin Shen, Kunhong Duan, Yao Xu, Zhujing Gao, Xingyu Ni, Xinjie Li, Tongcang Quantum Physics Optics 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. |
| title | Near-field GHz rotation and sensing with an optically levitated nanodumbbell |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2301.10868 |