# Localized magnetic plasmons in all-dielectric $\ensuremath{\mu}<0$ metastructures

• Paniagua-Domínguez, R. Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Madrid, Spain - Data Storage Institute, Agency for Science, Technology and Research, Singapore.
• Froufe-Pérez, Luis S. Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Madrid, Spain - Data Storage Institute, Agency for Science, Technology and Research, Singapore.
• Sáenz, J. J. Condensed Matter Physics Department and Centro de Investigación en Física de la Materia Condensada (IFIMAC), Universidad Autónoma de Madrid, Spain
11.06.2015
Published in:
• Physical Review B. - 2015, vol. 91, no. 23, p. 235120
English Metamaterials are known to exhibit a variety of electromagnetic properties nonexisting in nature. We show that an all-dielectric (nonmagnetic) system consisting of deep-subwavelength, high-permittivity resonant spheres possesses effective negative magnetic permeability (dielectric permittivity being positive and small). Due to the symmetry of the electromagnetic wave equations in classical electrodynamics, localized “magnetic” plasmon resonances can be excited in a metasphere made of such metamaterial. This is theoretically demonstrated by the coupled-dipole approximation and numerically for real spheres, in full agreement with the exact analytical solution for the scattering process by the same metasphere with effective material properties predicted by effective medium theory. The emergence of this phenomenon as a function of structural order within the metastructures is also studied. Universal conditions enabling effective negative magnetic permeability relate subwavelength sphere permittivity and size with critical filling fraction. Our proposal paves the way towards (all-dielectric) magnetic plasmonics, with a wealth of fascinating applications.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics