Beaming Visible Light with a Plasmonic Aperture Antenna.
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ABSTRACT: We investigate experimentally the parameter space defining, in the visible range, the far-field diffraction properties of a single circular subwavelength aperture surrounded by periodic circular grooves milled on a metallic film. Diffraction patterns emerging from such an antenna are recorded under parallel- and perpendicular-polarized illumination at a given illumination wavelength. By monitoring the directivity and the gain of the antenna with respect to a single aperture, we point out the role played by the near-field surface plasmon excitations. The results can be analyzed through a Huygens-Fresnel model, accounting for the coherent interaction between the field radiated by the hole and the plasmonic field, propagating along the antenna surface and diffracted away in free space.
SUBMITTER: Yi JM
PROVIDER: S-EPMC4270416 | biostudies-other | 2014 Apr
REPOSITORIES: biostudies-other
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