How grooves reflect and confine surfaceplasmon polaritons

The reflection of surface plasmon polaritons by deep linear grooves structured into gold surfaces is investigated with numerical finite-difference-in-time-domain as well as boundary-element-method calculations. Groove widths of 25 and 100 nm are studied, with depths as large as 500 nm. The reflectio...

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Bibliographic Details
Published inOptics express Vol. 17; no. 12; pp. 10385 - 10392
Main Authors Kuttge, Martin, García de Abajo, F Javier, Polman, Albert
Format Journal Article
LanguageEnglish
Published United States 08.06.2009
Subjects
Computer Simulation
Light
Models, Theoretical
Nanostructures - chemistry
Nanostructures - ultrastructure
Scattering, Radiation
Surface Plasmon Resonance - methods
Surface Properties
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Summary:The reflection of surface plasmon polaritons by deep linear grooves structured into gold surfaces is investigated with numerical finite-difference-in-time-domain as well as boundary-element-method calculations. Groove widths of 25 and 100 nm are studied, with depths as large as 500 nm. The reflection depends strongly on wavelength, groove depth, and width. By systematically varying these parameters and studying the field profiles in the grooves as well as mode dispersion, we relate the resonances of the reflectivity to resonant coupling of propagating planar plasmon modes to cavity modes inside the grooves. By careful design of the groove width and depth the reflectivity can be tuned to values up to at least 30% for either a narrow or wide band of wavelengths.
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ISSN:1094-4087