Realizing near-perfect absorption at visible frequencies.
Sub-wavelength hole array (SHA) combined with thick metal layer (TML) is shown to have simultaneous suppressed transmission and reflection, resulting near-perfect absorption. Unlike the simultaneous electric and magnetic resonances in electric ring resonator and cut wire [PRL, 100, 207402 (2008)], such behavior results from strong anti-symmetric surface plasmons coupling supported by SHA and TML. The polarization-free characteristic permits to construct an ideal absorber for some practical applications in turbid backgrounds.
Hu
Chenggang
C
State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China.
Zhao
Zeyu
Z
Chen
Xunan
X
Luo
Xiangang
X