META 2016

Producción CientíficaA planar complementary metamaterial, as well as its corresponding inverse structure, has been designed and characterized. Numerical results (using commercial software) are presented here. The structure shows a giant gyrotropy (chirality) as well as very low losses.Ministerio de Economía, Industria y Competitividad (Project TEC2014-55463-C3-2-P

EuCAP 2015

Producción CientíficaA partially complementary bilayer chiral metamaterial (CMM) is proposed and numerically studied. It exhibits a strong optical activity and a small circular dichroism. The retrieval results reveal that a negative refractive index is realized in a narrow band around the resonance of the chirality parameter.Ministerio de Economía, Industria y Competitividad (Project TEC2014-55463-C3-2-P

A complementary chiral metamaterial with giant electromagnetic activity and low losses

A planar complementary metamaterial, as well as its corresponding inverse structure, has been designed and characterized. Numerical results (using commercial software) are presented here. The structure shows a giant gyrotropy (chirality) as well as very low losses.This work has been supported by the Spanish Government (MINECO) through the Research Projects TEC2014-55463-C3-1-P, TEC2014-55463-C3-2-P, and TEC2014-55463-C3-3-P and also by the European Commission (ERDF)

Estudio de las propiedades numéricas de los métodos FDTD de dos pasos

In this work we analyze several two-stage split-step finite-difference time-domain (2SS-FDTD) schemes and compare their performance with that of the traditional FDTD formulation. We present the numerical dispersion relations and the local truncation errors. All the schemes studied show error terms that depend on the time step multiplied by the spatial derivatives. We show that these error terms are especially critical in the locally one-dimensional (LOD)-FDTD scheme. To illustrate the relevance of these terms we simulate the propagation of the fundamental mode in a rectangular waveguide with a narrow iris

Extensión del método de modos acoplados para el estudio de medios quirales ilimitados

The Coupled–Mode Method (CMM) is a semi–numerical method in the frequency domain for studying electromagnetic propagation, originally formulated for closed structures, widely used in the literature. In this paper, the formulation of the CMM is extended to the particular case of wave propagation in an unbounded isotropic chiral media (ICM) and the propagation constants and the electromagnetic field components are obtained numerically. To test the accuracy of the approximated results, comparisons with the analytical results are established

Análisis teórico–experimental de medios quirales isótropos en guía rectangular

In this communication a description of the hybrid technique combining the coupled mode method (CMM) and the mode matching method (MMM) is presented. This numerical tool is suitable for the analysis of general 3D structures implemented in rectangular waveguide. Also, this formulation is independent of the number of discontinuities of the structure. As an example, the analysis of a 3D structure formed by the arrangement of a waveguide section filled with an isotropic chiral material and inserted between to empty waveguide sections is proposed. Finally, the structure has been implemented in a rectangular waveguide and comparisons between the theoretic and experimental results are established

Iberian Meeting on Computational Electromagnetics (EIEC) (12º. 2018. Coimbra)

Producción CientíficaReflective surfaces (mirrors) have a wide use in the field of optical or electromagnetic applications, wherever it is needed to redirect electromagnetic radiation. Though mirror technology exists since more than 8,000 years ago, there is not yet a well-established technology for circular polarization control: even more, conventional mirrors reverse the handedness or circularly polarized waves. Bi-isotropic (chiral) structures have been proposed to manipulate the polarization of travelling waves (optical/electromagnetic activity and circular dichroism). Nevertheless, up to date, all the known examples of such materials are non-reciprocal.Ministerio de Economía, Industria y Competitividad (Project TEC2014-55463-C3-2-P

International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) (2017. Sevilla)

Producción CientíficaA bi-isotropic chiral structure has been numerically studied. It is composed of two layers of planar, 2D-chiral, honeycomb-like, parallel grids. Electromagnetic activity (gyrotropy) is observed. That leads to a strong chiral behavior with low losses.Ministerio de Economía, Industria y Competitividad and the European Commission (ERDF) (Project TEC2014-55463-C3- 2-P