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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Programmable flip-metasurface with dynamically tunable reflection and broadband undistorted transmission.

Cong Wang¹, Xiangteng Li¹, Hongchen Chu¹

¹National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

We developed a programmable flip-metasurface to control reflected waves dynamically. This innovative metasurface ensures transmitted wavefronts remain undistorted across an ultra-broad spectrum, enabling new applications.

Keywords:

programmable metasurface tunable reflection undistorted transmission

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Area of Science:

Metasurface technology
Wavefront manipulation
Electromagnetics

Background:

Metasurfaces offer precise control over electromagnetic waves.
Existing metasurfaces often struggle with simultaneous control of reflection and transmission.
Dynamic control of reflected waves without impacting transmission is a significant challenge.

Purpose of the Study:

To introduce a novel programmable flip-metasurface.
To demonstrate dynamic control of reflection while maintaining undistorted transmission.
To explore applications in ultra-broad spectrum wave manipulation.

Main Methods:

Designing unique meta-atoms capable of switching between two spatially inverted states.
Utilizing the principles of reciprocity and spatial inversion symmetry.
Numerical simulations and experimental validation of wave steering capabilities.

Main Results:

The flip-metasurface dynamically controls reflection (diffuse, focusing, beam-splitting).
Transmission remains undistorted and independent of the flip states across an ultra-broad spectrum.
The device operates irrespective of the incident wave frequency.

Conclusions:

A new approach for independent control of reflection and transmission is presented.
The programmable flip-metasurface offers versatile dynamic wave steering.
Potential applications include advanced wireless communications and stealth technologies.