Efficient visible light modulation based on electrically tunable all dielectric metasurfaces embedded in thin-layer...

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• All-dielectric metasurfaces offer efficient light manipulation but are typically passive.
• Achieving dynamic control in metasurfaces, especially for visible light, remains a significant challenge.

Purpose of the Study:

• To demonstrate a highly efficient, all-dielectric tunable metasurface operating at visible frequencies.
• To investigate the use of liquid crystals for electrically controlled refractive index tuning of metasurfaces.

Main Methods:

• Fabrication of metasurfaces using TiO2 nanodisks embedded in a liquid crystal layer.
• Electrical tuning of the liquid crystal's refractive index using low driving voltages (3-5 V).
• Optical characterization of metasurface resonances and transmission modulation.

Main Results:

• Demonstrated dynamic tuning of metasurface resonances with low voltages.
• Achieved over 65% transmission modulation.
• Observed shifts in electric and magnetic dipole resonances and analyzed the liquid crystal anchoring effect.

Conclusions:

• The developed all-dielectric tunable metasurface enables efficient visible light modulation.
• The liquid crystal tuning mechanism provides a pathway for dynamic metasurface devices.
• This work opens possibilities for advanced applications in visible light manipulation.