Fitting experimental dispersion data with a simulated annealing method for nano-optics applications

J Viquerat (1)

1 NACHOS - Numerical modeling and high performance computing for evolution problems in complex domains and heterogeneous media

A considerable amount of materials in nanophotonics are dispersive, enabling the propagation of so called surface plasmons at their interfaces with dielectrics. Hence, a reliable fit of frequency-dependent permittivity functions with an appropriate model is a first-order necessity for the accurate design of nano-optics devices with time-domain numerical methods, such as finite-difference time-domain (FDTD) or discontinuous Galerkin time-domain (DGTD). In this paper, we present the necessary ingredients to fit experimental permittivity functions using the simulated annealing (SA) method with a generalized second-order dispersion model implemented in the Diogenes software suite (see https://diogenes. inria.fr/). By scanning through different classes of materials, we come up with effective rules of thumb to make the fitting process fast and accurate.

Domaines: Modélisation et simulation

J Viquerat. Fitting experimental dispersion data with a simulated annealing method for nano-optics applications. Journal of Nanophotonics, 2018. ⟨hal-01930876⟩