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Related Experiment Video

Updated: Jun 5, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Fast tunable metamaterial liquid crystal achromatic waveplate.

Majd Abu Aisheh1, Mohammad Abutoama2, Marwan J Abuleil2

  • 1Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

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This study presents a miniature, fast tunable achromatic waveplate using a silicon nano-grating and a thin liquid crystal layer. The device offers tunable retardation for advanced optical applications in the short-wave infrared range.

Area of Science:

  • Photonics and Materials Science
  • Optoelectronics and Nanotechnology

Background:

  • Photonic metamaterials integrated with liquid crystals (LCs) enable high-performance miniature tunable optical devices.
  • Nano-grating surfaces can act as uniaxial waveplates with unique optical properties.

Purpose of the Study:

  • To develop a tunable achromatic waveplate using a silicon nano-grating and a thin liquid crystal layer for miniature optical devices.
  • To achieve fast switching between retardation states with wide spectral and angular operation.

Main Methods:

  • Designed and fabricated a silicon nano-grating (351 nm pitch) for short-wave infrared (SWIR) operation.
  • Integrated the metasurface with an 8 μm thick nematic liquid crystal (NLC) layer.
  • Achieved tunable achromatic retardation by applying voltages to the NLC cell.
Keywords:
liquid crystalsmetamaterialsnanogratingtunable achromatic waveplates

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Main Results:

  • Demonstrated a tunable achromatic waveplate with an 8 μm LC layer, significantly thinner than conventional NLC retarders.
  • Device operates over wide spectral and angular ranges with fast switching times (milliseconds).
  • Successfully switched between full-, half-, and quarter-waveplate retardation levels.

Conclusions:

  • The integrated metasurface-LC device offers a miniaturized and high-speed solution for tunable waveplates.
  • This technology has potential applications in fast shutters, interferometry, polarimetry, and smart windows.
  • The device provides dynamic control of light intensity and polarization states.