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Related Experiment Video

Updated: Mar 15, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Gate-Tunable Conducting Oxide Metasurfaces.

Yao-Wei Huang¹, Ho Wai Howard Lee, Ruzan Sokhoyan

¹Department of Physics, National Taiwan University , Taipei 10617, Taiwan.

|August 27, 2016

Summary

This summary is machine-generated.

This study introduces a novel gate-tunable metasurface offering dynamic electrical control over light reflection. This breakthrough enables versatile amplitude and phase modulation for advanced optical applications.

Keywords:

Metasurfaces beam steering epsilon-near-zero materials field-effect modulation modulators phase modulation plasmonics transparent conducting oxides

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Area of Science:

Photonics and Metamaterials
Optoelectronics
Applied Physics

Background:

Metasurfaces enable extraordinary light manipulation with ultrathin optical components.
Current metasurfaces lack tunable amplitude and phase control after fabrication, limiting applications.

Purpose of the Study:

To experimentally demonstrate a gate-tunable metasurface with dynamic electrical control over reflected light.
To enable versatile modulation of phase and amplitude for reconfigurable optical elements.

Main Methods:

Fabrication of metasurface antenna elements incorporating conducting oxide layers.
Utilizing field-effect modulation of the complex refractive index for tunability.
Configuring metasurface elements in a reflectarray geometry for light manipulation.

Main Results:

Achieved a 180° phase shift and ~30% reflectance change with a 2.5 V gate bias.
Demonstrated modulation frequencies exceeding 10 MHz.
Showcased electrical switching of diffracted beams by controlling subgroups of metasurface elements.

Conclusions:

Electrically gated phase and amplitude control allows for individual element addressability.
Opens pathways for reconfigurable beam steering, dynamic holograms, and tunable lenses.
Enables advanced ultrathin optical components for imaging and sensing technologies.