Mixed plasmons coupling for expanding the bandwidth of near-perfect absorption at visible frequencies
- 4 September 2009
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 17 (19), 16745-16749
- https://doi.org/10.1364/oe.17.016745
Abstract
We theoretically investigate the electromagnetic response of mixed-size sub-wavelength square hole array (M-SHA) combined with thick metal layer (TML). Near-perfect absorption with bandwidth about 17nm is firstly observed. Field distribution and dispersion relationship indicate that mixed surface plasmons (M-SPs) coupling is supported by M-SHA and TML. The absorption band is proved to be dominated by M-SPs coupling.Keywords
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