Related Experiment Video
Updated: Jul 19, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.3K
Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront
Parikshit Moitra1, Xuewu Xu1, Rasna Maruthiyodan Veetil1
1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
ACS Nano
|August 16, 2023
Summary
This study introduces a tunable metasurface spatial light modulator (SLM) using liquid crystals. The device offers dynamic wavefront shaping for applications like LiDAR and holography.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- All-dielectric optical metasurfaces offer nanoscale control over light's amplitude and phase for wavefront shaping.
- Limited postfabrication tunability hinders the full application potential of current metasurfaces.
Purpose of the Study:
- To develop a tunable metasurface spatial light modulator (SLM) with active phase control.
- To overcome the limitations of static metasurfaces by introducing postfabrication tunability.
Main Methods:
- Integration of a thin liquid crystal (LC) layer with an optical metasurface.
- Utilizing 96 individually addressable electrodes with a ~1 μm pixel pitch for dynamic control.
- Achieving continuous resonance tuning via LC layer modulation.
Main Results:
- Demonstration of a phase-only SLM with high reflection in the visible spectrum.
- Achieved 2π phase control with uncoupled amplitude modulation.
- Showcased dynamic beam steering with a wide field-of-view and high diffraction efficiencies.
Conclusions:
- The developed LC-integrated metasurface enables high-resolution, tunable wavefront shaping.
- This technology paves the way for next-generation SLMs for dynamic holography, tunable optics, and LiDAR.
