期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 14, 期 6, 页码 1522-1529出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2008.923291
关键词
Electromagnetic theory; reciprocity; scattering; surface plasmon polariton
资金
- Fondation Franco-Chinoise pour la Science et ses Applications (FFCSA)
- China Scholarship Council (CSC)
A fully vectorial Fourier-modal-method approach combined with the Lorentz reciprocity theorem is used to study the capability of isolated subwavelength objects to launch surface plasmon polaritons on a nearby surface under illumination by light. Various 2-D subwavelength geometries, like grooves or ridges, are considered and compared. The highest efficiencies are achieved for metallic ridges isolated from the surface by a dielectric post. We derive general trends with respect to the geometry, the incidence angle, and the frequency of the incident illumination. We additionally discuss particular effects that provide very high efficiencies or unidirectional launchings. The predictions may be useful for further understanding and engineering plasmonic systems formed by nanoparticle ensembles.
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