期刊
PHYSICAL REVIEW APPLIED
卷 12, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.12.064016
关键词
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The coherent perfect absorber (CPA) and laser are a pair of inversely worked wave structures that satisfy the time-reversal relation. We point out that, if the wave energy absorbed by the CPA can be recovered and then be reemitted by its corresponding laser, the combination of CPA and laser will be a wave-controlling device that can move the wave energy from one place to another. By extending the concepts of the CPA and laser from previously studied one-dimensional non-Hermitian systems to the two-dimensional ones, this understanding is used to simplify the design of the metasurface in this paper. As examples, an angular-asymmetric transmitting metasurface and wave splitter, which act as a perfect transmitter and retroreflector for waves coming from two oppositely tilted angles and splitting an incident wave into two directions with arbitrary amplitude ratio and phase difference, respectively, are constructed by combining two pieces of the separately designed CPAs. The idea not only greatly simplifies the design of a metasurface, but also bridges between research into the metasurface and a non-Hermitian system.
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