title: Mixed plasmons coupling for expanding the bandwidth of near-perfect absorption at visible frequencies.
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 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.
authors.affiliation: State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu 610209, China.
authors.forename: Chenggang
authors.initials: C
authors.lastname: Hu
authors.forename: Liyuan
authors.initials: L
authors.lastname: Liu
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Zhao
authors.forename: Xu'nan
authors.initials: X
authors.lastname: Chen
authors.forename: Xiangang
authors.initials: X
authors.lastname: Luo