GAN, Choon How; LALOUAT, Loïc; LALANNE, Philippe; AIGOUY, Lionel

doi:10.1103/PhysRevB.83.085422

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GAN, Choon How
Laboratoire Charles Fabry de l'Institut d'Optique / Naphel

LALOUAT, Loïc
Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) [LPEM]

LALANNE, Philippe
lp2n-03,lp2n-13
Laboratoire Charles Fabry de l'Institut d'Optique / Naphel

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2011, vol. 83, p. 085422

American Physical Society

Résumé en anglais

Much effort has been recently devoted to the study of the electromagnetic field launched on a metal-dielectric interface by one-dimensional (1D) subwavelength indentations. In this work, we consider the wave launched on a semiconductor surface that does not support any surface modes, in contrast to the metallic case. Through analytical calculations performed for polarized 2D Dirac line sources, we show that the waves launched by the two orthogonal polarizations (parallel and perpendicular to the surface) have approximately the same form, differing only in phase and magnitude. This finding implies that the wave launched on the surface by an arbitrary subwavelength indentation under an arbitrary illumination, either at grazing, normal, or oblique incidence, is always the same and possesses universal characteristics.We further observe this wave on a silicon substrate with a near-field probe. Through fitting with a simple model, the measured field is found to exhibit characteristics that are reminiscent of quasicylindrical waves on metal surfaces.< Réduire