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Phase-only transmissive spatial light modulator based on tunable dielectric metasurface.

Shi-Qiang Li1, Xuewu Xu1, Rasna Maruthiyodan Veetil1

  • 1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore.

Science (New York, N.Y.)
|June 15, 2019
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Summary

We developed a novel tunable dielectric metasurface spatial light modulator (SLM) using liquid crystals. This technology enables miniaturized pixels for advanced augmented reality, LIDAR, and holographic displays.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Display Technology

Background:

  • Augmented reality, LIDAR, and holographic displays demand advanced spatial light modulators (SLMs).
  • Current SLMs are limited by large pixel sizes (several micrometers), hindering performance.
  • There is a need for high-resolution, wide-viewing-angle SLMs to meet growing technological requirements.

Purpose of the Study:

  • To propose and demonstrate a novel metasurface-based spatial light modulator.
  • To overcome the pixel size limitations of existing SLMs.
  • To enable miniaturization and enhance performance for next-generation display and sensing technologies.

Main Methods:

  • Concept development of tunable dielectric metasurfaces modulated by liquid crystals.
  • Fabrication of a transmissive SLM utilizing this metasurface concept.
  • Characterization of the SLM's beam steering capabilities, including efficiency and deflection angle.

Main Results:

  • Achieved active beam steering with over 35% efficiency.
  • Demonstrated a large beam deflection angle of 11 degrees.
  • The proposed metasurface enables significant pixel-size miniaturization.

Conclusions:

  • The developed metasurface-based SLM offers a pathway to overcome current technological limitations.
  • This innovation provides high resolution and a large steering angle, crucial for advanced applications.
  • The technology holds significant potential for the next generation of LIDAR and display systems.