Flat bands in metamaterials based on angularly layered metal–dielectric scatterers

El-Jallal, Said; Torrent, Daniel

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1088/1361-6463/aa5cee

Titre :

Flat bands in metamaterials based on angularly layered metal–dielectric scatterers

Auteur(s) :

El-Jallal, Said [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Torrent, Daniel [Auteur]
Centre de Recherche Paul Pascal [CRPP]

Titre de la revue :

Journal of Physics D: Applied Physics

Pagination :

125103

Éditeur :

IOP Publishing

Date de publication :

2017-03-29

ISSN :

0022-3727

Mot(s)-clé(s) en anglais :

Metamaterials
Anisotropy
Periodic media
Polar anisotropy
Flat bands
Low group velocity

Discipline(s) HAL :

Physique [physics]/Physique [physics]/Optique [physics.optics]

Résumé en anglais : [en]

In this work, we propose the realization of electromagnetic metamaterials in two and three dimensions by means of highly anisotropic rods and spheres. The two-dimensional case is deeply analyzed, and the realization of an ...
Lire la suite >In this work, we propose the realization of electromagnetic metamaterials in two and three dimensions by means of highly anisotropic rods and spheres. The two-dimensional case is deeply analyzed, and the realization of an anisotropic rod by means of angularly layered cylinders is proposed. The band structure of a periodic arrangement of angularly layered rodsis computed, showing a low frequency band gap and some flat modes within it which increases as a function of the number of sectors in the cylinder. The system is studied by means of an effective medium approach, and it is found that the flat bands correspond to a sharp frequency region where the effective metamaterial is doubly negative. A perfect agreement is found between the dispersion curves obtained by means of the effective medium model and the full band structure computed by the finite element method. It is also found that only four sectors in the angularly layered cylinder are enough to obtain the desired double negativity, which is a promising result in view of the fabrication of the presented structures. Finally, the three-dimensional version of these materials is analyzed by means of anisotropic spheres, showing similar results.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Projet ANR :

Advanced Materials by Design
Initiative d'excellence de l'Université de Bordeaux

Collections :

Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL

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