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Surface-plasmon polariton scattering from a finite array of nanogrooves/ridges: Efficient mirrors

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2 Author(s)
Sanchez-Gil, Jose A. ; Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 121, 28006 Madrid, Spain ; Maradudin, Alexei A.

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The scattering of surface-plasmon polaritons (SPP) by finite arrays of one-dimensional nanodefects on metal surfaces is theoretically investigated on the basis of the reduced Rayleigh equation. Numerical calculations are carried out that rigorously account for all the scattering channels: SPP reflection and transmission, and radiative leakage. We analyze the range of parameters (defect size and number) for which high SPP reflection efficiency (low radiative losses) is achieved within a SPP band gap (negligible SPP transmission), neglecting ohmic losses (justified for array lengths significantly shorter than the SPP inelastic length): Smaller defects play better as SPP mirrors (e.g., efficiency ≫90% at λ∼650 nm for Gaussian ridges/grooves with sub-30 nm height and half-width) than larger defects, since the latter yield significant radiative losses.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 25 )

Date of Publication:

Jun 2005

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