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A mathematical design strategy for highly dispersive resonator systems

by K. Alexopoulos and B. Davies

(Report number 2022-44)

Abstract
Designing devices composed of many small resonators is a challenging problem that can easily incur significant computational cost. Can asymptotic techniques be used to overcome this often limiting factor? Integral methods and asymptotic techniques have been used to derive concise characterisations for scattering by resonators, but can these be generalised to systems of many dispersive resonators whose material parameters have highly non-linear frequency dependence? In this paper, we study halide perovskite resonators as a demonstrative example. We extend previous work to show how a finite number of coupled resonators can be modelled concisely in the limit of small radius. We also show how these results can be used as the basis for an inverse design strategy, to design resonator systems that resonate at specific frequencies.

Keywords: asymptotic expansion, halide perovskite, metamaterial, structural colour, non-linear permittivity, coupling, hybridization

@Techreport{AD22_1032,
  author = {K. Alexopoulos and B. Davies},
  title = {A mathematical design strategy for highly dispersive resonator systems},
  institution = {Seminar for Applied Mathematics, ETH Z{\"u}rich},
  number = {2022-44},
  address = {Switzerland},
  url = {https://www.sam.math.ethz.ch/sam_reports/reports_final/reports2022/2022-44.pdf },
  year = {2022}
}

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