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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Quasi-Continuous Metasurface Beam Splitters Enabled by Vector Iterative Fourier Transform Algorithm.

Jinzhe Li^1,2, Fei Zhang¹, Mingbo Pu^1,2

¹State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu 610209, China.

Materials (Basel, Switzerland)

|March 6, 2021

Summary

This summary is machine-generated.

A new vector iterative Fourier transform algorithm (IFTA) enables rapid, accurate design of quasi-continuous metasurface beam splitters. This method overcomes limitations of traditional approaches for subwavelength optical devices.

Keywords:

beam splitter iterative Fourier transform algorithm quasi-continuous metasurface vector diffraction theory

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Area of Science:

Optics and Photonics
Metamaterials
Computational Electromagnetics

Background:

Quasi-continuous metasurfaces are crucial optical components, but their subwavelength structures challenge conventional design methodologies like scalar diffraction theory.
Existing optimization algorithms for metasurface design often suffer from high computational costs or insufficient accuracy, hindering practical applications.

Purpose of the Study:

To introduce a novel vector iterative Fourier transform algorithm (IFTA) for the efficient and accurate design of quasi-continuous metasurface beam splitters.
To demonstrate the algorithm's capability in creating metasurface beam splitters with tailored diffraction patterns and high performance.

Main Methods:

Development and application of a vector iterative Fourier transform algorithm (IFTA) specifically for metasurface beam splitter design.
Numerical simulations to validate the proposed IFTA by designing and analyzing various beam splitters, including a 7x7 array.

Main Results:

The vector IFTA achieves accurate and low-cost design of quasi-continuous metasurface beam splitters, outperforming traditional methods.
Demonstrated beam splitters exhibit custom diffraction patterns, with a maximum diffraction angle of 70° and a uniformity error as low as 0.0195.
Results show excellent agreement between simulated energy distribution and target patterns.

Conclusions:

The proposed vector IFTA offers a powerful and efficient tool for designing complex metasurface optical devices.
The demonstrated performance suggests significant potential for the vector IFTA in advanced applications such as 3D imaging, lidar, and machine vision.