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Optimized anti-reflection core-shell microspheres for enhanced optical trapping by structured light beams.

Vahid Shahabadi1, Ebrahim Madadi2, Daryoush Abdollahpour3,4

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This summary is machine-generated.

Optical trapping of core-shell microspheres is enhanced using structured light beams. Anti-reflection properties and specific beam types dramatically improve trapping strength compared to Gaussian beams.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Optical trapping utilizes light beams to manipulate microparticles.
  • Core-shell microspheres offer tunable optical properties.
  • Structured light beams provide enhanced control over optical forces.

Purpose of the Study:

  • To investigate the optical trapping of anti-reflection core-shell microspheres.
  • To compare the trapping efficiency of Gaussian and structured light beams.
  • To determine optimal core-shell configurations for enhanced optical trapping.

Main Methods:

  • Simulations of optical trapping using regular Gaussian and structured beams (radially polarized Gaussian, petal, hard-aperture-truncated circular Airy).
  • Analysis of anti-reflection properties of core-shell microspheres (polystyrene-silica, anatase-amorphous titania).
  • Calculation of trapping strength and scattering forces for various configurations.

Main Results:

  • Anti-reflection core-shell microspheres significantly enhance trapping strength compared to Gaussian beams.
  • Optimal core-shell thickness ratios minimize scattering forces, acting as anti-reflection coatings.
  • Trapping strength increased up to 2-fold with Gaussian beams and up to 4-fold with radially polarized beams for coated vs. uncoated microparticles.

Conclusions:

  • Structured light beams, particularly radially polarized and petal beams, offer superior optical trapping of anti-reflection core-shell microspheres.
  • The design of core-shell microspheres with anti-reflection properties is crucial for maximizing trapping efficiency.
  • Specific beam-particle combinations (e.g., radially polarized beam for titania, petal beam for silica) yield the highest trapping strengths.