English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Deriving analytical expressions of dielectric permittivities is required fornumerical and physical modeling of optical systems and the soar ofnon-hermitian photonics motivates their prolongation in the complex plane.Analytical models are based on the association of microscopic models todescribe macroscopic effects. However, the question is to know whether theresulting Debye Drude Lorentz models are not too restrictive. Here we show thatthe permittivity must be treated as a meromorphic transfer function thatcomplies with the requirements of complex analysis. This function can benaturally expanded on a set of complex singularities. This singularityexpansion of the dielectric permittivity allows us to derive a generalizedexpression of the Debye Drude Lorentz model that complies with the requirementsof complex analysis and the constraints of physical systems. We show that thecomplex singularities and other parameters of this generalized expression canbe retrieved from experimental data acquired along the real frequency axis. Theaccuracy of this expression is assessed for a wide range of materials includingmetals, 2D materials and dielectrics, and we show how the distribution of theretrieved poles helps in characterizing the materials.

Generalized Drude-Lorentz Model Complying with the Singularity Expansion Method