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arXiv · 1212.4035

Plasmon scattering from single sub-wavelength holes

N. Rotenberg·M. Spasenovic·T. L. Krijger·B. le Feber·F. J. Garcıa de Abajo·L. Kuipers
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Abstract

We map the complex electric fields associated with the scattering of surface plasmon polaritons by single sub-wavelength holes of different sizes in thick gold films. We identify and quantify the different modes associated with this event, including a radial surface wave with an angularly isotropic amplitude. This wave is shown to arise from the out-of-plane electric dipole induced in the hole, and we quantify the corresponding polarizability, which is in excellent agreement with electromagnetic theory. Time-resolved measurements reveal a time-delay of 38? +/- 18 fs between the surface plasmon polariton and the radial wave, which we attribute to the interaction with a broad hole resonance.

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N. Rotenberg, M. Spasenovic, T. L. Krijger, B. le Feber, F. J. Garcıa de Abajo, L. Kuipers. 2012-12-17. Plasmon scattering from single sub-wavelength holes. https://doi.org/10.1103/physrevlett.108.127402

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