Journal
ACS PHOTONICS
Volume 1, Issue 4, Pages 365-370Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph400146n
Keywords
subwavelength aperture; surface plasmons; nanoantenna; antenna gain; antenna directivity
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Funding
- ERC [227557]
- French program Investissement d'Avenir (Equipex Union)
- Chinese Scholarship Council (CSC)
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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.
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