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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Optical forces on small particles from partially coherent light.

Juan Miguel Auñón1, Manuel Nieto-Vesperinas

  • 1Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Campus de Cantoblanco, Madrid, Spain.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|July 4, 2012
PubMed
Summary
This summary is machine-generated.

We present a theory for optical forces on dipolar particles in partially coherent light. The force depends on light

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Area of Science:

  • Optics
  • Atomic, Molecular and Chemical Physics
  • Classical Physics

Background:

  • Optical forces are crucial for manipulating microscopic particles.
  • Understanding forces in partially coherent light is essential for advanced optical applications.

Purpose of the Study:

  • To develop a theoretical framework for optical forces exerted by partially coherent light fields.
  • To analyze the conservative and nonconservative components of these forces.
  • To investigate the influence of light coherence on optical forces.

Main Methods:

  • Rigorous mathematical analysis of electromagnetic force.
  • Derivation of force in terms of the coherence tensor.
  • Characterization of force components.
  • Establishment of force propagation laws.

Main Results:

  • The ensemble-averaged electromagnetic force is determined by the spatial gradient of the coherence tensor's diagonal elements.
  • Distinct conservative and nonconservative force components were identified.
  • A propagation law for optical force was established using the coherence function.

Conclusions:

  • The degree of coherence significantly affects optical force components.
  • The study provides a theoretical basis for predicting and controlling optical forces in partially coherent light.