Frequency-adjustable stable rotating device in vacuum optical tweezers system and use method

A stable rotation and optical tweezers technology, applied in the field of precision measurement, can solve problems such as disturbance, instability, and large rotation frequency line width

Active Publication Date: 2021-09-10
ZHEJIANG UNIV +1
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  • Abstract
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Problems solved by technology

Moreover, the circularly polarized light method is used to control the rotation speed through the balance of optical field drive and gas retardation, so that t

Method used

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  • Frequency-adjustable stable rotating device in vacuum optical tweezers system and use method
  • Frequency-adjustable stable rotating device in vacuum optical tweezers system and use method
  • Frequency-adjustable stable rotating device in vacuum optical tweezers system and use method

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0046] Such as figure 1 As shown, the present invention includes a laser source LS, a polarization control device, a vacuum chamber VC, an objective lens OL, and micro-nano particles MS; and the micro-nano particles MS are sequentially arranged along the light direction; the light direction is the light propagation direction. A laser source LS provides laser light for trapping and driving particle rotation. The polarization control device is used to control the polarization state of the light beam. The vacuum chamber VC provides a close-to-vacuum measurement environment for micro-nano particles, and the wall of the vacuum chamber VC close to the quarter-wave plate QWP has a light-transmitting optical window for the light beam to pass through / pass through. The objective lens OL is used to converge the light beam, and the micro-nano particles MS are the medi...

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Abstract

The invention discloses a frequency-adjustable stable rotating device in a vacuum optical tweezers system and a use method. The device comprises a vacuum cavity, micro-nano particles, a laser source, an objective lens and a polarization control device, wherein the objective lens and the micro-nano particles are placed in the vacuum cavity, the laser source, the polarization control device, the objective lens and the micro-nano particles are sequentially arranged in a light direction, the polarization control device comprises a first half-wave plate, a polarizing beam splitter, a second half-wave plate, an electro-optical modulator and a quarter-wave plate, and the first half-wave plate, the polarizing beam splitter, the second half-wave plate, the electro-optical modulator and the quarter-wave plate are sequentially arranged in the light direction. According to the invention, the function of controlling the micro-nano particles to stably rotate at a set frequency in a vacuum optical tweezers system is realized by utilizing the modulation effect of the electro-optical modulator on light beam polarization and combining the interaction characteristic of linearly polarized light and the micro-nano particles with anisotropic polarizability.

Description

technical field [0001] The invention relates to a device for realizing the stable rotation of micro-nano particles in a vacuum, belonging to the technical field of precision measurement, in particular to a frequency-adjustable stable rotation device in a vacuum optical tweezers system and a use method thereof. Background technique [0002] In the 1970s, American physicist Ashkin and others took advantage of the properties that objects would be subjected to radiation force and gradient force in the light field, and invented the optical tweezers technology to capture tiny particles. This technology is widely used in research fields such as fluid mechanics and thermodynamics. Later, the vacuum optical tweezers technology was developed, which uses light to trap particles in a vacuum. This method can be well decoupled from the environment, thereby obtaining very high measurement accuracy. For example, vacuum optical tweezers can be used to measure non-Newtonian gravity, Casimir ...

Claims

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Application Information

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IPC IPC(8): G21K1/00
CPCG21K1/006
Inventor 胡慧珠陈铭苏鹤鸣陈杏藩高晓文李楠刘承
Owner ZHEJIANG UNIV
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