We study the evanescent waveʼs behavior on a device made of a plane interface separating vacuum from a perfect negative index material. The system is described by the macroscopic Maxwellʼs equations with frequency-dependent permittivity and permeability. Assuming that electromagnetic sources with sinusoidal time dependence are switched on at an initial time, we show that, as time increases, evanescent waves result in surface modes at the plane interface. The time dependence of these surface modes is oscillating but not harmonic since their amplitude linearly increases with time. As a consequence, we find that the image of a point source is not a point image. The analysis avoids any ambiguity related with causality and finite energy requirements.
Nous étudions le comportement des ondes évanescentes en présence dʼune interface plane séparant le vide et un matériau dʼindice négatif parfait. Ce système est modélisé par les équations de Maxwell macroscopiques avec des permittivité et perméabilité fonctions de la fréquence. Nous supposons que le champ électromagnétique est rayonné par des sources variant sinusoïdalement dans le temps après allumage à un instant initial. Nous montrons alors que quand le temps croît, les ondes évanescentes produisent des modes de surface sur lʼinterface plane. Ces modes de surfaces oscillent dans le temps mais ne sont pas harmoniques car leur amplitude croît linéairement dans le temps. Par conséquent, nous montrons que lʼimage dʼun point source nʼest plus ponctuelle. La description évite toute ambigüité relative à la causalité et lʼénergie électromagnétique.
Mot clés : Matériaux dʼindice négatif, Lentille plate, Ondes évanescentes, Équations de Maxwell macroscopiques
Boris Gralak 1; Daniel Maystre 1
@article{CRPHYS_2012__13_8_786_0, author = {Boris Gralak and Daniel Maystre}, title = {Negative index materials and time-harmonic electromagnetic field}, journal = {Comptes Rendus. Physique}, pages = {786--799}, publisher = {Elsevier}, volume = {13}, number = {8}, year = {2012}, doi = {10.1016/j.crhy.2012.04.003}, language = {en}, }
Boris Gralak; Daniel Maystre. Negative index materials and time-harmonic electromagnetic field. Comptes Rendus. Physique, Volume 13 (2012) no. 8, pp. 786-799. doi : 10.1016/j.crhy.2012.04.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.04.003/
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