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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
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Gyroscope: Precession01:24

Gyroscope: Precession

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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相关实验视频

Updated: Jul 12, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
09:48

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

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近场GHz旋转和传感与一个光学上升的纳米贝.

Peng Ju1, Yuanbin Jin1, Kunhong Shen1

  • 1Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, United States.

Nano letters
|November 1, 2023
PubMed
概括

我们用光学方式悬浮一个纳米,以达到千兆赫的旋转速度,为基础物理研究创建一个超灵敏的扭矩探测器.

关键词:
卡西米尔扭矩是指卡西米尔扭矩.悬浮式光学机械 悬浮式光学机械纳米转子是一个纳米转子.近场相互作用的近场相互作用.非牛顿式的重力.扭矩传感器可以传感扭矩.

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Fabrication and Operation of a Nano-Optical Conveyor Belt
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Fabrication and Operation of a Nano-Optical Conveyor Belt

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Implementation of a Reference Interferometer for Nanodetection
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Implementation of a Reference Interferometer for Nanodetection

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相关实验视频

Last Updated: Jul 12, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

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Fabrication and Operation of a Nano-Optical Conveyor Belt

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Implementation of a Reference Interferometer for Nanodetection

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科学领域:

  • 量子物理学的量子物理学
  • 纳米技术纳米技术
  • 表面科学是一门科学.

背景情况:

  • 悬浮的非球形纳米粒子为量子旋转研究提供了独特的平台.
  • 它们作为超灵敏的扭矩探测器,用于探测基本的粒子-表面相互作用.

研究的目的:

  • 在真空中以光学方式悬浮一个纳米.
  • 驱动纳米旋以GHz频率在表面附近旋转.
  • 为了描述它的扭矩灵敏度,并探索近场光学现象.

主要方法:

  • 在真空中对纳米进行光学悬浮.
  • 在蓝宝石表面附近以 GHz 频率旋转纳米.
  • 探测近场激光强度分布使用纳米附近的纳米.

主要成果:

  • 实现了GHz旋转频率为悬浮的纳米.
  • 在室温下显示的扭矩灵敏度为 (5.0 ± 1.1) × 10-26 N m Hz-1/2.
  • 成功探测了超出光学衍射极限的近场激光强度.

结论:

  • 悬浮纳米系统是基础物理学的强大工具.
  • 它显示了测量卡西米尔扭矩和改善非牛顿引力检测极限的潜力.