Cylindrical vector beams of light from an electrically excited plasmonic lens
Résumé
The production of cylindrical vector beams from a low-energy, electric, microscale light source is demonstrated both experimentally and theoretically. This is achieved by combining a “plasmonic lens” with the ability to locally and electrically excite propagating surface plasmons on gold films. The plasmonic lens consists of concentric circular subwavelength slits that are etched in a thick gold film. The local excitation arises from the inelastic tunneling of electrons from the tip of a scanning tunneling microscope. We report on the emission of radially polarized beams with an angular divergence of less than ±4°.
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Cao, APL 105, 111103 (2014) - cylindrical vector beams of light from an electrically excited plasmonic lens.pdf (1.45 Mo)
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