Oblique launching of optical surface waves by a subwavelength slit

Details Oblique launching of optical surface waves by a subwavelength slit Oblique launching of optical surface waves by a subwavelength slit

2011-02-07

arxiv.org/abs/1102.1252v1

Physics

Condensed Matter

Other Condensed Matter

8 pages, 5 figures

Scientific paper

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 wavevector 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 NW are more intense than surface plasmons decrease with parallel wavevector, which could help experimental studies on Norton waves. Additionally, it is found that the s-polarization component, while present for any non-zero parallel wavevector, only weakly contributes to the NWs.

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