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Article Dans Une Revue Nanotechnology Année : 2014

Plasmon scattering from holes: from single hole scattering to Young's experiment

Résumé

In this paper, the scattering of surface plasmon polaritons (SPPs) into photons at holes is investigated. A local, electrically excited source of SPPs using a scanning tunneling microscope (STM) produces an outgoing circular plasmon wave on a thick (200 nm) gold film on glass containing holes of 250, 500 and 1000 nm diameter. Fourier plane images of the photons from holescattered plasmons show that the larger the hole diameter, the more directional the scattered radiation. These results are confirmed by a model where the hole is considered as a distribution of horizontal dipoles whose relative amplitudes, directions, and phases depend linearly on the local SPP electric field. An SPPYoung's experiment is also performed, where the STMexcited SPP wave is incident on a pair of 1 m diameter holes in the thick gold film. The visibility of the resulting fringes in the Fourier plane is analyzed to show that the polarization of the electric field is maintained when SPPs scatter into photons. From this SPPYoung's experiment, an upper bound of 200 nm for the radius of this STMexcited source of surface plasmon polaritons is determined.
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Dates et versions

hal-00999776 , version 1 (16-12-2022)

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T. Wang, Elizabeth Boer-Duchemin, G. Comtet, Eric Le Moal, Gérald Dujardin, et al.. Plasmon scattering from holes: from single hole scattering to Young's experiment. Nanotechnology, 2014, 25, pp.125202. ⟨10.1088/0957-4484/25/12/125202⟩. ⟨hal-00999776⟩
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