Theory of surface plasmon generation at nanoslit apertures

Details Theory of surface plasmon generation at nanoslit apertures Theory of surface plasmon generation at nanoslit apertures

2005-12-22

arxiv.org/abs/physics/0512212v1

Phys. Rev. Lett. 95, 263902 (2005)

Physics

Optics

10 pages, 5 figures, article

Scientific paper

10.1103/PhysRevLett.95.263902

In this letter, we study the scattering of light by a single subwavelength slit in a metal screen. In contrast to previous theoretical works, we provide a microscopic description of the scattering process by emphasizing the generation of surface plasmons at the slit apertures. The analysis is supported by a rigorous formalism based on a normal-mode-decomposition technique and by a semi-analytical model which provides accurate formulae for the plasmonic generation strengths. The generation is shown to be fairly efficient for metals with a low conductivity, like gold in the visible regime. Verification of the theory is also shown by comparison with recent experimental data [H.F. Schouten et al., Phys. Rev. Lett. 94, 053901 (2005)].

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