Direct visualization of surface-plasmon bandgaps in the diffuse background of metallic gratings

When a surface plasmon propagates along a microrough grating, it interacts with the periodic plus the random roughness and emits light into the diffuse background, which can present intensity maxima called diffuse light bands. We reexamine previous studies on these bands within the framework of rece...

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Bibliographic Details
Published in:Optics letters 2004-10, Vol.29 (19), p.2216-2218
Main Authors: DEPINE, Ricardo A, LEDESMA, Silvia
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Collective excitations (including plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diffraction and scattering
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gratings
Optical elements, devices, and systems
Optics
Physics
Surface and interface electron states
Wave optics
Wave propagation in random media
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Summary:When a surface plasmon propagates along a microrough grating, it interacts with the periodic plus the random roughness and emits light into the diffuse background, which can present intensity maxima called diffuse light bands. We reexamine previous studies on these bands within the framework of recent studies on photonic surfaces and show that the phenomenon of diffuse light provides an experimental technique for directly imaging the dispersion relation of surface plasmons, including the gap that, under appropriate circumstances, opens in the reciprocal grating space.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.29.002216