Increased cut-off wavelength for a subwavelength hole in a real metal | Zendy

Reuven Gordon | Zendy; Alexandre G. Brolo | Zendy

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Increased cut-off wavelength for a subwavelength hole in a real metal

Author(s) -

Reuven Gordon,

Alexandre G. Brolo

Publication year - 2005

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/opex.13.001933

Subject(s) - optics , wavelength , surface plasmon , rayleigh scattering , plasmon , materials science , coupling (piping) , dispersion (optics) , extraordinary optical transmission , surface plasmon polariton , finite difference time domain method , physics , metallurgy

A waveguide mode of a subwavelength rectangular hole in a real metal is analyzed. Due to coupling between surface plasmons on the long edges of the hole, the cut-off wavelength increases as the hole-width is reduced. The cut-off wavelength is found to be much larger than Rayleigh's criterion for perfect metals - 2.3 times as large for a 15 nm wide hole. The analytical results are verified by finite-difference calculations. The finite difference calculations also show the influence of including material loss.

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