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Electrically Tunable Gap Surface Plasmon-based Metasurface for Visible Light.

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  • 1Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, China.

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This study presents an electrically tunable metasurface for visible light applications. The device enables continuous electrical modulation of resonant wavelength and steering angle for dynamic metadevices.

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Area of Science:

  • Plasmonics
  • Metasurfaces
  • Optoelectronics

Background:

  • Metasurfaces offer unique light manipulation capabilities.
  • Electrical tunability is crucial for dynamic optical devices.
  • Visible regime applications require precise wavelength control.

Purpose of the Study:

  • To design and theoretically demonstrate an electrically tunable metasurface for the visible spectrum.
  • To achieve continuous modulation of resonant wavelength and steering angle.
  • To provide a novel design for active plasmonic and dynamic metadevices.

Main Methods:

  • Fabrication of a V-shaped metallic metasurface on a silica substrate.
  • Integration of an indium tin oxide (ITO) film and an electro-optic (EO) dielectric layer.
  • Application of a voltage range (-20V to 20V) to modulate the EO dielectric's refractive index.

Main Results:

  • Demonstrated continuous electrical modulation of resonant wavelength from 555 nm to 640 nm.
  • Observed simultaneous tuning of steering angle with selective color.
  • Achieved peak cross-polarized reflectivity >48% with a narrow bandwidth <60 nm.
  • Explained wavelength shift via voltage-induced refractive index changes affecting gap surface plasmon (GSP) resonance.

Conclusions:

  • The proposed V-shaped metasurface design enables effective electrical tuning in the visible range.
  • This work offers a viable solution for active plasmonic devices and dynamic metadevices.
  • The demonstrated tunability and performance metrics are promising for future optical applications.