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Updated: Oct 20, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Diffuse reflection and reciprocity-protected transmission via a random-flip metasurface.

Hongchen Chu¹, Xiang Xiong¹, Ya-Jun Gao¹

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

Science Advances

|September 13, 2021

Summary

Researchers developed random-flip metasurfaces that scatter light diffusely upon reflection but allow clear, undistorted transmission. This breakthrough merges rough-surface scattering with smooth-surface clarity across a wide spectrum.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Rough surfaces cause light diffusion in reflection and transmission, degrading image quality.
Achieving both diffuse reflection and undistorted transmission simultaneously has been a significant challenge in optics.

Purpose of the Study:

To introduce and demonstrate a novel metasurface capable of diffuse reflection and distortion-free transmission.
To overcome the incompatibility between light scattering and clear image transmission.

Main Methods:

Concept development of random-flip metasurfaces utilizing randomly oriented components.
Fabrication of metasurfaces based on complementary random arrays of gold nanorods.
Experimental verification using optical spectroscopy and imaging across visible to infrared frequencies.

Main Results:

Demonstrated metasurfaces with globally random phase for diffuse reflection.
Confirmed distortion-free transmission due to local space inversion and reciprocity principles.
Achieved simultaneous rough-surface reflection and smooth-surface transmission properties over a broad spectrum.

Conclusions:

Random-flip metasurfaces successfully decouple phase correlation between reflection and transmission.
This technology offers a unique optical property applicable to new optical materials and display technologies.