Publication

Optimal origin selection for minimal multipolar modeling of bianisotropic metasurfaces

2026

Abstract

We develop a modeling framework based on multipolar decomposition that fully captures a metasurface electromagnetic response while using the minimum number of multipole moments, since excessive multipoles make modeling complex and computationally ineffective. One of the most important characteristics that determines the required number of multipole moments is the choice of the origin of the system of coordinates used for the multipolar decomposition. Here, we split multipolar contributions into even and odd parities and find their corresponding optimal scattering centers that minimize higher-order multipolar contributions. This allows us to model a metasurface, which would otherwise require higher-order multipoles, with only dipolar responses thus greatly simplifying its analysis.

Official source

https://infoscience.epfl.ch/entities/publication/d01624f9-ded8-4d94-b1af-3c64cd13cda3

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d01624f9-ded8-4d94-b1af-3c64cd13cda3

About this result

Related concepts (30)

Natural selection

Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations. Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which is intentional, whereas natural selection is not. Variation exists within all populations of organisms. This occurs partly because random mutations arise in the genome of an individual organism, and their offspring can inherit such mutations.

Directional selection

In population genetics, directional selection, is a mode of negative natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. Under directional selection, the advantageous allele increases as a consequence of differences in survival and reproduction among different phenotypes. The increases are independent of the dominance of the allele, and even if the allele is recessive, it will eventually become fixed.

Electric dipole moment

The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity. The SI unit for electric dipole moment is the coulomb-meter (C⋅m). The debye (D) is another unit of measurement used in atomic physics and chemistry. Theoretically, an electric dipole is defined by the first-order term of the multipole expansion; it consists of two equal and opposite charges that are infinitesimally close together, although real dipoles have separated charge.