4.8 Article

Automatic Inverse Design of High-Performance Beam-Steering Metasurfaces via Genetic-type Tree Optimization

期刊

NANO LETTERS
卷 21, 期 12, 页码 4981-4989

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00720

关键词

Inverse design; Beam deflection; Active beam-steering metasurface; Monte Carlo tree search; Stochastic optimization; Integer-valued optimization

资金

  1. Ministry of Science and Technology (MOST), Taiwan [107-2923-M-006-004-MY3, 108-2112-M-006-021-MY3]
  2. Higher Education Sprout Project of Ministry of Education (MOE)
  3. Einstein Program (Young Scholar Fellowship Program) [MOST 109-2636-E-006-022]
  4. Ministry of Education (Yushan Young Scholar Program), Taiwan

向作者/读者索取更多资源

The researchers have successfully achieved automatic inverse design of high-performance metasurfaces through a genetic-type tree search algorithm combined with unsupervised clustering, providing highly directive beam steering. The optimized metasurfaces exhibit consistent directivity at different beam steering angles, while also reducing the requirements for light scattering properties, offering potential for a wide range of advanced nanophotonic applications.
We introduce a genetic-type tree search (GTTS) algorithm combined with unsupervised clustering for the automatic inverse design of high-performance metasurfaces. With the proposed method, we realize highly directive beam-steering metasurfaces via the cooptimization of the amplitude and phase. In comparison with previous topology optimization approaches, the developed GTTS algorithm optimizes the organization of subwavelength nanoantennas and, thus, is applicable to the design of both passive and active metasurfaces. The optimized beam-steering metasurface specifically exhibits a nearly constant directivity when the steering angle varies from 5 degrees to 30 degrees. Furthermore, the optimized nonintuitive reflectance and phase profiles assist in achieving highly directive beam steering when the phase modulation range is <18 degrees, which was previously challenging. Our approach can diminish the requirements of scattering light properties with substantially enhanced angular resolution of beam-steering metasurfaces, which enables the realization of high-performance metasurfaces that will be promising for a wide range of advanced nanophotonic applications.

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