Abstract
Nous passons en revue les dernières avancées dans l’application du cadre de l’optique transformationnelle pour la description analytique des phénomènes électromagnétiques en régime fortement sub-longueur d’onde. En premier lieu, nous présentons une description générale de la technique, ainsi que son exploitation usuelle dans la conception et l’optimisation des métamatériaux dans différentes disciplines de la physique des ondes. En second lieu, nous discutons en détail de la conception de métasurfaces plasmoniques, y compris la description de géométries singulières qui permettent une absorption sur une large plage de fréquences dans les plates-formes ultra-minces. Enfin, nous discutons du traitement quasi-analytique du couplage fort plasmon–exciton dans les nanocavités au niveau d’un seul émetteur.
Highlights
The development of Transformation Optics [1, 2] (TO) has been instrumental in the fast growth that metamaterial science has experienced during the last years [3]
Subwavelength arrays of ultra sharp grooves in a metal surface can turn good reflectors such as gold or silver into almost perfect broadband absorbers, usually referred to as plasmonic black metals [96]. These surfaces can be viewed as singular plasmonic metasurfaces [97] and here we review two instances of them, sheding light onto their continuous absorption spectra and highlighting how these can be interpreted by means of an extra compacted dimension
We have first reviewed its impact in metamaterial science for the design of electromagnetic devices and other aspects, such as the control of surface waves or its extension into other realms of wave physics
Summary
The development of Transformation Optics [1, 2] (TO) has been instrumental in the fast growth that metamaterial science has experienced during the last years [3]. The SP field extends both into the dielectric and metallic sides of the interface, it has been shown that it is enough to act on the dielectric side by placing the metamaterial designed with (1) on top of the metal surface [35] Doing the same derivation for the magnetic permeability, one has that conformal transformations preserve isotropic electromagnetic properties in the plane of the transformation This has been used in recent years as a means to shed analytical, instead of numerical, insight into plasmonic phenomena taking place in deeply subwavelength metallic devices, thereby recovering the initial purpose of TO of aiding in solving Maxwell’s equations. The description of strong-coupling phenomena between quantum emitters and the plasmonic spectrum supported by metallic nanocavities
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