Abstract
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)].
Original language | English |
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Pages (from-to) | 9477-9482 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 14 |
Issue number | 20 |
DOIs | |
State | Published - Oct 2006 |
Bibliographical note
Funding Information:Financial support of the National Cancer Institute of Canada, the Medical Research Council of Canada, and the Ontario Cancer Treatment and Research Foundation is appreciated