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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Fast Switching Dual-Frequency Nematic Liquid Crystal Tunable Filters.

Olha Melnyk1, Reed Jones1, Rair Macêdo2

  • 1UCCS Biofrontiers Center and Department of Physics and Energy Science, University of Colorado Colorado Springs, Colorado Springs, Colorado 80918, United States.

ACS Photonics
|June 7, 2021
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Summary

We developed fast-switching tunable optical filters using liquid crystal optical retarders. These filters enable ms-speed wavelength selection, significantly outperforming mechanical filters for applications like fluorescence microscopy.

Keywords:
TIRF microscopycell imagingdual-frequency nematicsliquid crystalstunable filters

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Biophysics

Background:

  • Traditional optical filters often have slow switching speeds, limiting real-time applications.
  • Mechanical filter wheels are common but can be slow and bulky.
  • Liquid crystal (LC) technology offers potential for fast electro-optical modulation.

Purpose of the Study:

  • To develop tunable optical filters with rapid wavelength switching capabilities.
  • To utilize dual-frequency nematic liquid crystal optical retarders for precise optical filtering.
  • To demonstrate the application of these filters in advanced microscopy techniques.

Main Methods:

  • Designed filters using a series of two liquid crystal optical retarders with specific thicknesses.
  • Employed individual biasing schemes to continuously tune filter wavelength and bandwidth.
  • Performed theoretical predictions and experimental characterization of electro-optical filter performance.
  • Integrated the filters into a total internal reflection fluorescence microscopy setup.

Main Results:

  • Achieved filter switching speeds in the millisecond (ms) regime, an order of magnitude faster than mechanical filters.
  • Demonstrated continuous tuning of filter wavelength and bandwidth.
  • Obtained fluorescence images comparable in quality to those from conventional filters.
  • Validated the filter's effectiveness in a total internal reflection fluorescence microscopy application.

Conclusions:

  • Tunable optical filters based on dual-frequency nematic liquid crystal optical retarders offer significantly faster switching speeds.
  • The developed filters provide precise control over wavelength and bandwidth, suitable for dynamic optical applications.
  • This technology represents a substantial advancement over conventional filter wheels, particularly for demanding imaging modalities like fluorescence microscopy.