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Related Experiment Video

Updated: May 7, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Flexible terahertz beam manipulation and convolution operations in light-controllable digital coding metasurfaces.

Min Jia¹, Chao Zhao¹, Hui Wang¹

¹Communication Research Center, School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150080, China.

|February 5, 2025

Summary

This summary is machine-generated.

This study introduces a novel optically controlled tunable coding metasurface. It enables ultra-fast dynamic switching of terahertz beams and advanced wave modulation for practical applications.

Keywords:

Applied sciences Natural sciences Physics

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Area of Science:

Metasurface technology
Terahertz (THz) optics
Optoelectronics

Background:

Coding metasurfaces are crucial for beam modulation but lack dynamic tunability, hindering practical terahertz applications.
Existing terahertz coding metasurfaces face limitations in real-time control and adaptability.
The need for dynamic tunability is a significant barrier in developing advanced metasurface components.

Purpose of the Study:

To design and implement a wireless optically controlled tunable coding metasurface.
To achieve ultra-fast dynamic switching of terahertz beams and dynamic convolution operations.
To explore the dynamic modulation of vortex electromagnetic waves and broadband radar scattering reduction.

Main Methods:

Integration of photosensitive silicon into the metasurface structure for optical control.
Utilizing wireless light-control for ultra-fast dynamic switching and convolution operations.
Employing a genetic algorithm for reverse design to achieve radar scattering reduction.

Main Results:

Demonstrated ultra-fast dynamic switching of terahertz beams.
Achieved dynamic convolution operations with a 2-bit coding metasurface.
Successfully modulated vortex electromagnetic waves using the optically controlled metasurface.
Utilized genetic algorithm for broadband radar scattering cross-section reduction.

Conclusions:

The developed wireless optically controlled tunable coding metasurface overcomes the dynamic tunability limitations of traditional metasurfaces.
This technology enables novel applications in terahertz beam modulation, wave manipulation, and electromagnetic compatibility.
The non-contact, optically controlled dynamic metasurface holds significant potential for future practical implementations.