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Dielectrophoretically controlled Fresnel zone plate.

A F Chrimes1, I Khodasevych, A Mitchell

  • 1School of Electrical and Computer Engineering, RMIT University, Melbourne, Australia. af.chrimes@ieee.org.

Lab on a Chip
|December 20, 2014
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Summary

Researchers developed a switchable microfluidic lens using dielectrophoresis (DEP) to control nanoparticle arrangements. This creates a tunable optical device for focusing light on demand, enabling new applications in optofluidics.

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Area of Science:

  • Optofluidics
  • Nanophotonics
  • Microfluidics

Background:

  • Switchable optical elements are crucial for advanced planar optical systems.
  • Controllable manipulation of nanomaterials offers a pathway to dynamic optical functionalities.
  • Existing methods for creating switchable optical devices often lack integration and on-demand control.

Purpose of the Study:

  • To demonstrate a novel planar diffractive microfluidic lens.
  • To integrate controlled dielectrophoresis (DEP) for manipulating nanoparticle suspensions.
  • To achieve on-demand optical switching for focusing visible light.

Main Methods:

  • Fabrication of a microfluidic device capable of trapping nanomaterials.
  • Utilizing dielectrophoresis (DEP) forces to arrange silicon and tungsten oxide nanoparticles.
  • Formation of a diffractive Fresnel zone plate structure using DEP-controlled nanoparticle rings.

Main Results:

  • Successfully created alternating opaque and transparent nanoparticle rings using DEP.
  • Demonstrated the formation of a functional planar diffractive Fresnel zone plate lens.
  • Achieved controlled switching (on/off) of the lens's focusing capability for visible light.

Conclusions:

  • The developed microfluidic lens offers a switchable and tunable optical focusing capability.
  • This proof-of-concept highlights the potential of DEP-driven nanomaterial assembly in optofluidics.
  • The technology can be integrated into lab-on-a-chip and other micro-scale optical systems.