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Designer gratings, also known as metagratings, can be tuned to preform various kinds of tasks, such as amplify deflection in a particular diffraction order, increase or decrease transmission and reflection [1]. A typical task for various kinds of coatings is to reduce reflection from a surface. Inspired by this, we set out to design a single-layer silicon metagrating as an antireflection cover for solar cells, itself made from silicon, which introduces high reflection of light (30-50%) from a flat interface, a significant inefficiency in the cells' ability to capture incident radiation [2]. To achieve desired low reflection (around 5% or less) for both polarizations, a range of incidence angles and a wide band from 400 to 1200 nm, a large space of unit cell designs of the periodic structure has to be explored. In this work, we apply an inverse design approach [3] to solve this task and denerate patterns which demonstrate the required performance.
- Quaranta G., Basset G., Martin O. J., Gallinet B. Recent advances in resonant waveguide gratings // Las. Photonics Rev. – 2018. – 12. – №9. – P. 1800017.
- Mascaretti L. et al. Designing metasurfaces for efficient solar energy conversion // ACS Photonics. – 2023. – 10. – №12. – P. 4079.
- Jiang J., Fan J. A. Multiobjective and categorical global optimization of photonic structures based on ResNet generative neural networks // Nanophotonics. – 2020. – 10. – №1. – P. 361.
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