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Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications
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Laser-Induced Microsphere Hammer-Hit Vibration in Liquid.

Yu Zhang1, Yaxun Zhang1,2, Zhihai Liu1

  • 1Key Lab of In-fiber Integrated Optics, Ministry Education of China, College of Science, Harbin Engineering University, 150001 Harbin, China.

Physical Review Letters
|October 13, 2018
PubMed
Summary

We show how laser light can induce vibration in microparticles using photophoretic forces in glycerol. This new method allows precise control over microparticle movement in liquids.

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Area of Science:

  • Optics and Photonics
  • Soft Matter Physics
  • Microfluidics

Background:

  • Optical manipulation techniques are crucial for controlling microparticles.
  • Photophoresis, the movement of particles induced by light, has been explored for particle manipulation.
  • Controlling microparticle vibrations in liquid media remains a challenge.

Purpose of the Study:

  • To demonstrate a novel principle for laser-induced hammer-hit vibration of microparticles in a liquid.
  • To investigate the role of light-induced photophoretic forces in driving microparticle vibration.
  • To achieve full control over trapped microparticle vibration parameters.

Main Methods:

  • Utilizing a single divergent Gaussian beam to irradiate a micron-sized black sphere in glycerol.
  • Leveraging the light-induced differential cross-section (Δα)-photophoretic force for particle actuation.
  • Analyzing the influence of vibrating speed on the photophoretic force.

Main Results:

  • Successfully demonstrated laser-induced hammer-hit vibration of a microparticle in glycerol.
  • Identified the Δα-photophoretic force as the key mechanism for both pushing and pulling forces.
  • Showcased precise control over vibration frequency, amplitude, and position of the microparticle.

Conclusions:

  • This work introduces a new optical manipulation principle for microparticle vibration in liquids.
  • The demonstrated method offers enhanced control over microparticle dynamics via photophoresis.
  • The findings have potential applications in microfluidics and particle manipulation research.