Optimization of an isotropic metasurface on a substrate
- Authors: Dombrovskaya Z.O.1
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Affiliations:
- Lomonosov Moscow State University
- Issue: Vol 30, No 2 (2022)
- Pages: 115-126
- Section: Articles
- URL: https://journals.rudn.ru/miph/article/view/30950
- DOI: https://doi.org/10.22363/2658-4670-2022-30-2-115-126
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Abstract
Mathematical statement of one-wavelength antireflective coating based on two-dimensional metamaterial is formulated for the first time. The constraints on geometric parameters of the structure are found. We propose a penalty function, which ensures the applicability of physical model and provides the uniqueness of the desired minimum. As an example, we consider the optimization of metasurface composed of PbTe spheres located on germanium substrate. It is shown that the accuracy of the minimization with properly chosen penalty term is the same as for the objective function without it.
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1. Introduction Last few years the designs of nanostructured coatings with the reflection coefficient close to zero attract a great attention. Such coatings are promising for solar cells and other photovoltaic elements which work both in the visible and in the infrared ranges. Nowadays, high refractive index all-dielectric meta-atoms are used [1], [2] instead of plasmonics [3], [4] in order to reduce Joule losses. Commonly, the properties of substrated metasurfaces are calculated numerically. The computations are complicated due to big divergence of characteristic scales: resonator size can be 3-20 times smaller then the wavelengthAbout the authors
Zhanna O. Dombrovskaya
Lomonosov Moscow State University
Author for correspondence.
Email: dombrovskaya@physics.msu.ru
ORCID iD: 0000-0003-0609-1065
Candidate of Physical and Mathematical Sciences, Junior Researcher of Faculty of Physics
1, bld. 2, Leninskie Gory, Moscow, 119991, Russian FederationReferences
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