Ultrawideband dispersion control of a metamaterial surface for perfectly-matched-layer-like absorption.
Narrow bandwidth is a fundamental issue plaguing practical applications of metamaterial absorbers. In this Letter, we show that by deliberately controlling the dispersion and dissipation of a metamaterial, an ultrawideband perfect metamaterial absorber with complex-valued constitutive parameters strictly satisfying the modified model of a perfectly matched layer, can be achieved. The nearly perfect power absorption, better than 99%, was experimentally observed in an unprecedented bandwidth of 39%, approaching the theoretical Rozanov limit. We expect a wide range of applications to emerge from this general concept.
Laboratory of Applied Research on Electromagnetics (ARE), Zhejiang University, Hangzhou 310027, China and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Dexin
D
Ye
Zhiyu
Z
Wang
Kuiwen
K
Xu
Huan
H
Li
Jiangtao
J
Huangfu
Zheng
Z
Wang
Lixin
L
Ran