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Measuring the wavelength-dependent divergence of transmission through sub-wavelength hole-arrays by spectral imaging
Author(s) -
Margreet W. Docter,
Ian Young,
O.M. Piciu,
A. Bossche,
Paul F. A. Alkemade,
P.M. van den Berg,
Yuval Garini
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.009477
Subject(s) - optics , collimated light , wavelength , extraordinary optical transmission , transmission (telecommunications) , physics , divergence (linguistics) , visibility , materials science , surface plasmon , plasmon , surface plasmon polariton , telecommunications , laser , linguistics , philosophy , computer science
We present a study on the far-field patterns of light transmitted through sub-wavelength metallic hole-arrays. Spectral imaging measurements are used here on hole arrays for the first time. It provides both spatial and spectral information of the transmission in far-field. The visibility of the images, measured in two illumination modes: Köhler and collimated, is calculated for different planes in and out of focus. The transmission under collimated illumination reveals that 75% of the beam if non-divergent. The results are in agreement with the low divergence measured by Lezec [Science 297, 820 (2002)].

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