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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Uniform 2D Target Generation via Inverse-designed Metasurfaces
Yushi Zhou1, Yun-Sheng Chen1, Yang Zhao1
1Department of Electrical and Computer Engineering, Grainger College of Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801 USA.
IEEE Journal of Selected Topics in Quantum Electronics : a Publication of the IEEE Lasers and Electro-Optics Society
|May 6, 2026
Summary
This study introduces a new inverse design method for metasurfaces, creating highly uniform light intensity patterns for specific shapes. The approach optimizes efficiency and reduces non-uniformity for better performance than standard methods.
Area of Science:
- Optics and Photonics
- Computational Electromagnetics
- Materials Science
Background:
- Metasurfaces offer precise control over light wavefronts.
- Achieving uniform intensity profiles with arbitrary shapes remains a challenge.
- Existing methods often struggle with uniformity and efficiency.
Purpose of the Study:
- To develop an inverse design framework for metasurfaces.
- To achieve highly uniform 2D intensity profiles across on-demand shapes.
- To enhance projection efficiency and suppress field amplitude deviations.
Main Methods:
- Adjoint method for optimization objective.
- Regularization term to penalize intensity non-uniformity.
- Adaptive tuning of regularization weight.
- Finite Element Method (FEM) for surrogate modeling.
- Finite-Difference Time-Domain (FDTD) simulations for verification.
Main Results:
- Superior performance in intensity fidelity and uniformity compared to Mean Squared Error (MSE).
- Stable and efficient optimization process.
- Framework extended to handle Gaussian beam illumination.
- Demonstrated generation of high-quality, uniform field patterns.
Conclusions:
- The proposed inverse design framework effectively generates uniform 2D intensity profiles on metasurfaces.
- The adaptive regularization strategy ensures stable and efficient optimization.
- The method shows significant improvements over conventional approaches for metasurface design.
