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High resolution multispectral spatial light modulators based on tunable Fabry-Perot nanocavities.

Shampy Mansha1, Parikshit Moitra1, Xuewu Xu1

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This study introduces a novel spatial light modulator (SLM) design for multi-spectral operation. The new device enables miniaturized pixels and dynamic wavefront manipulation across red, green, and blue wavelengths.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Spatial light modulators (SLMs) are crucial for dynamic wavefront manipulation in applications like displays and optical communications.
  • Liquid Crystal on Silicon (LCoS) SLMs offer high precision but face limitations in pixel miniaturization due to inter-pixel crosstalk.
  • Metasurface-based SLMs allow for smaller pixels but are typically monochromatic, restricting multi-wavelength applications.

Purpose of the Study:

  • To develop a novel SLM design that overcomes the limitations of current technologies, enabling both small pixel size and multi-spectral operation.
  • To demonstrate a new class of SLMs for advanced applications in displays, optical computing, and communications.

Main Methods:

  • Engineered liquid crystal-tunable Fabry-Perot nanocavities supporting multiple resonances across the visible spectrum (red, green, blue).
  • Fabricated a device with 96 individually addressable pixels with a pitch of approximately 1 micrometer.
  • Demonstrated continuous 2π phase modulation with high reflectance at operating wavelengths.

Main Results:

  • Achieved multi-spectral programmable beam steering with a field of view (FOV) of approximately 18° and absolute efficiencies exceeding 40%.
  • Demonstrated multi-spectral lensing with tunable focal distance and efficiencies around 27%.
  • The device operates across red, green, and blue wavelengths, showcasing its multi-spectral capabilities.

Conclusions:

  • The novel LC-tunable nanocavity design successfully integrates small pixel size with multi-spectral operation for SLMs.
  • This breakthrough paves the way for advanced SLM applications in displays, optical computing, and beyond.
  • The demonstrated device offers continuous phase modulation and high efficiency across multiple wavelengths.