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Electrically switchable computer-generated hologram using a liquid crystal cell with a proton beam patterned

D Luo1, X W Sun, Y J Liu

  • 1School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore.

Applied Optics
|July 3, 2009
PubMed
Summary
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Researchers created an electrically switchable computer-generated hologram (CGH) using liquid crystals (LC). Proton beam patterning of a PMMA film on an LC cell enabled voltage-controlled holographic displays with high diffraction efficiency.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Liquid Crystal Displays

Background:

  • Computer-generated holograms (CGH) are essential for holographic displays and optical data storage.
  • Developing electrically switchable holographic devices is crucial for real-time holographic applications.
  • Liquid crystal (LC) materials offer tunable optical properties suitable for dynamic holographic elements.

Purpose of the Study:

  • To fabricate an electrically switchable computer-generated hologram (CGH) using a liquid crystal (LC) cell.
  • To investigate the holographic performance and switching characteristics of the fabricated device.

Main Methods:

  • A liquid crystal (LC) cell was fabricated with a polymethylmethacrylate (PMMA) film spin-coated on a glass substrate.
  • The PMMA film was patterned with a CGH phase pattern using a focused 2 MeV proton beam with 2 microm resolution.

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Last Updated: Jun 22, 2026

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  • An electrical voltage was applied to the LC cell to induce index modulation via LC reorientation.

    • Main Results:

    • The fabricated device demonstrated electrically switchable holographic functionality.
    • A maximum diffraction efficiency of approximately 28.7% was achieved.
    • The device operated at a low voltage, below 15 V(rms).

    Conclusions:

    • An electrically switchable CGH was successfully fabricated using a proton-beam-patterned PMMA film in an LC cell.
    • The device exhibits efficient diffraction and low operating voltage, making it suitable for dynamic holographic applications.
    • This work presents a promising approach for developing advanced holographic display and optical processing technologies.