Open AccessMixed plasmons coupling for expanding the bandwidth of near-perfect absorption at visible frequencies
Author(s) -
Chenggang Hu,
Liyuan Liu,
Zeyu Zhao,
Xu'nan Chen,
Xiangang Luo
Publication year - 2009
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.17.016745
Subject(s) - surface plasmon , optics , materials science , plasmon , bandwidth (computing) , wavelength , coupling (piping) , absorption (acoustics) , near and far field , dispersion (optics) , electromagnetic field , optoelectronics , physics , telecommunications , quantum mechanics , computer science , metallurgy
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 17 nm 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.