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Hydrodynamically tunable optofluidic cylindrical microlens.

Xiaole Mao1, John Robert Waldeisen, Bala Krishna Juluri

  • 1Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA.

Lab on a Chip
|September 27, 2007
PubMed
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Researchers developed a tunable optofluidic microlens using two miscible fluids. Changing flow rates alters the lens

Area of Science:

  • Optofluidics
  • Microfluidics
  • Optical Engineering

Background:

  • Integrating optical components into microfluidic devices presents challenges.
  • Tunable lenses are crucial for adaptable optical systems.

Purpose of the Study:

  • To design, fabricate, and characterize a tunable optofluidic microlens.
  • To demonstrate a method for creating adjustable focusing elements within microfluidic systems.

Main Methods:

  • Utilized co-injected miscible fluids (5 M CaCl(2) and deionized water) with different refractive indices.
  • Generated a microlens at the fluidic interface within a curved microchannel.
  • Employed computational fluid dynamics (CFD) and confocal microscopy to study interface shape.
  • Experimentally characterized focusing via intensity measurements and image analysis.

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Main Results:

  • A reliable cylindrical microlens was formed by the bowed fluidic interface.
  • Microlens curvature and focal length were tunable by adjusting fluid flow rates.
  • Experimental results were validated by ray-tracing optical simulations.

Conclusions:

  • A simple, robust, and effective mechanism for optofluidic tunable microlenses was demonstrated.
  • This technology is suitable for integration into lab-on-a-chip systems.
  • The tunable microlens offers adaptable light manipulation in microscale devices.