Oblique launching of optical surface waves by a subwavelength slit
EntityUAM. Departamento de Física Teórica de la Materia Condensada
PublisherAmerican Physical Society
10.1103/PhysRevB.83.155448Physical Review B 83.15 (2011): 155448
ISSN1550-235X (online); 1098-0121 (print)
Funded byThe authors acknowledge support from the Spanish Ministr of Science and Innovation under Grant Nos. MAT2009-6609-C02 and CSD2007-046-NanoLight.es. A.Y.N. acknowledges the Juan de la Cierva Grant No. JCI-2008-3123
ProjectGobierno de España. MAT2009- 06609-C02; Gobierno de España. CSD2007-046-Nanolight.es
Rights© 2011 American Physical Society
The electromagnetic field on the metal surface launched by a subwavelength slit is analytically studied for the case when the fundamental mode inside the slit has a wave-vector component along the slit axis (conical mount). Both near-field and far-field regions are discussed, and the role of surface plasmon-polaritons and Norton waves is revealed. It is shown that the distance from the slit at which Norton waves are more intense than surface plasmons decreases with the parallel wave vector. Additionally, it is found that the s-polarization component, while present for any nonzero parallel wave vector, only weakly contributes to the Norton waves
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