Mixed plasmons coupling for expanding the bandwidth of near-perfect absorption at visible frequencies

Chenggang Hu; Liyuan Liu; Zeyu Zhao; Xu'nan Chen; Xiangang Luo

doi:10.1364/OE.17.016745

Mixed plasmons coupling for expanding the bandwidth of near-perfect absorption at visible frequencies

Opt Express. 2009 Sep 14;17(19):16745-9. doi: 10.1364/OE.17.016745.

Authors

Chenggang Hu¹, Liyuan Liu, Zeyu Zhao, Xu'nan Chen, Xiangang Luo

Affiliation

¹ State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu 610209, China.

PMID: 19770890
DOI: 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 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.

Publication types

Research Support, Non-U.S. Gov't