Increased cut-off wavelength for a subwavelength hole in a real metal
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- 1 January 2005
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 13 (6) , 1933-1938
- https://doi.org/10.1364/opex.13.001933
Abstract
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.Keywords
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