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Pneumatically tunable optofluidic 2 × 2 switch for reconfigurable optical circuit.

Wuzhou Song1, Demetri Psaltis

  • 1School of Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland. wuzhou.song@epfl.ch

Lab on a Chip
|May 28, 2011
PubMed
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We developed a novel optofluidic switch using compressed air for precise on-chip light routing. This device enables efficient light control in microfluidic systems, enhancing integrated optical circuits.

Area of Science:

  • Optofluidics
  • Microfluidics
  • Photonics

Background:

  • Integrated optical circuits require efficient light routing components.
  • Optofluidic devices offer miniaturization and reconfigurability for optical systems.

Purpose of the Study:

  • To present a pneumatically tunable 2x2 optofluidic switch for on-chip light routing.
  • To demonstrate its integration into a reconfigurable optical waveguide circuit for microfluidic spectroscopy.

Main Methods:

  • Fabrication of the switch using soft-lithography with polydimethylsiloxane (PDMS).
  • Utilizing a tunable air-gap mirror controlled by compressed air for light deflection via total internal reflection.
  • Implementing pressure-induced air gap collapse for switching between bypass and crossover states.

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Main Results:

  • Achieved a switching speed exceeding 5 Hz.
  • Obtained an extinction ratio of 8 dB.
  • Demonstrated successful integration into a reconfigurable optical waveguide circuit.

Conclusions:

  • The pneumatically tunable optofluidic switch offers a viable solution for on-chip light routing.
  • The device is readily integrable with microfluidic circuits for applications like spectroscopy.