1.
Opt Lett
; 42(6): 1145-1148, 2017 Mar 15.
Article
in English
| MEDLINE
| ID: mdl-28295069
ABSTRACT
In this Letter, we describe a very general procedure to obtain a causal fit of the permittivity of materials from experimental data with very few parameters. Unlike other closed forms proposed in the literature, the uniqueness of this approach lies in its independence on the material or frequency range at stake. Many illustrative numerical examples are given, and the accuracy of the fitting is compared to other expressions in the literature.