Retrieval of effective electromagnetic properties in terahertz: From organics to metamaterials

Abstract

In this work, the terahertz frequency range is exploited. From organic materials to metamaterials, different algorithms able to extract their effective electromagnetic properties were developed. In order to characterize different concentrations of lactose, such samples were submitted to a terahertz time-domain spectroscopy (TTDS) to experimentally acquire their transmission spectrum. With only these input data, the retrieval method employed parametrization of the refractive index by using the Lorentz model. Extending the studies to metamaterials, single and hybrid geometries based on split ring resonator (SRR) were simulated and characterized utilizing the Kramer-Kronig relations in an algorithm whose response was the effective permittivity and permeability of this class of materials.