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Related Experiment Videos

Optically tunable guided-mode resonance filter.

Dennis W Dobbs1, Brian T Cunningham

  • 1Department of Elecrtical and Computer Engineering, Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Applied Optics
|September 20, 2006
PubMed
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We developed a tunable guided-mode resonance filter (GMRF) using nonlinear dye. Laser light dynamically adjusts the filter

Area of Science:

  • Photonics and optical materials science.
  • Nonlinear optics and optoelectronics.

Background:

  • Guided-mode resonance filters (GMRFs) are optical devices with unique spectral properties.
  • Tuning GMRF properties typically requires external stimuli or structural modifications.

Purpose of the Study:

  • To demonstrate a novel method for tuning GMRF properties using laser illumination.
  • To investigate the use of nonlinear dyes for dynamic spectral control in GMRFs.

Main Methods:

  • Incorporation of a nonlinear dye into the GMRF structure.
  • Exposure of the GMRF to laser illumination to induce refractive index changes.
  • Characterization of the GMRF reflectance spectrum before, during, and after laser exposure.

Main Results:

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  • Laser illumination reversibly tuned the GMRF reflectance spectrum.
  • Refractive index changes (Δn) up to 0.09 were achieved, proportional to laser intensity.
  • The tuning effect occurred over several seconds and was fully reversible.

Conclusions:

  • Nonlinear dye-doped GMRFs offer a viable platform for laser-tunable optical filters.
  • Dynamic spectral control of GMRFs is achievable through light-induced refractive index modulation.
  • This technology holds potential for applications requiring reconfigurable optical filters.