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Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation.

Zichen Zhang1, Haining Yang, Brian Robertson

  • 1Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.

Applied Optics
|June 15, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a method to measure and compensate optical phase variations on liquid crystal on silicon devices. The technique significantly reduces unwanted diffraction orders, improving device performance for optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Liquid crystal on silicon (LCoS) devices are crucial for spatial light modulation.
  • Phase-only LCoS devices require precise control over optical phase response.
  • Spatial variations in phase can degrade device performance and introduce crosstalk.

Purpose of the Study:

  • To develop a method for measuring optical response across phase-only LCoS devices.
  • To introduce a procedure for compensating spatial optical phase variations.
  • To evaluate the effectiveness of the compensation method for binary and non-binary gratings.

Main Methods:

  • Utilized binary phase gratings to probe the surface optical response.
  • Implemented a phase compensation procedure to correct for spatial variations.
  • Quantified improvements using diffraction efficiency measurements and crosstalk analysis.

Main Results:

  • Reduced residual power in the first diffraction order by over 10 dB (from -15.98 dB to -26.29 dB) for binary gratings.
  • Demonstrated the applicability of the phase compensation method to non-binary gratings.
  • Achieved a 5.32 dB reduction in worst-case crosstalk using quantized blazed gratings.

Conclusions:

  • The developed method effectively measures and compensates spatial optical phase variations in LCoS devices.
  • Phase compensation significantly enhances the performance of LCoS devices by reducing unwanted diffraction and crosstalk.
  • This technique offers a practical solution for improving the fidelity of phase-only spatial light modulators.