Journal article

Multiband coherent perfect absorption in a water-based metasurface

Weiren Zhu, Ivan D Rukhlenko, Fajun Xiao, Chong He, Junping Geng, Xianling Liang, Malin Premaratne, Ronghong Jin

Optics Express | OPTICAL SOC AMER | Published : 2017

Abstract

We design an ultrathin water-based metasurface capable of coherent perfect absorption (CPA) at radio frequencies. It is demonstrated that such a metasurface can almost completely absorb two symmetrically incident waves within four frequency bands, each having its own modulation depth of metasurface absorptivity. Specifically, the absorptivity at 557.2 MHz can be changed between 0.59% and 99.99% via the adjustment of the phase difference between the waves. The high angular tolerance of our metasurface is shown to enable strong CPA at oblique incidence, with the CPA frequency almost independent of the incident angle for TE waves and varying from 557.2 up to 584.2 MHz for TM waves. One can also..

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Grants

Awarded by Natural Science Foundation of Shanghai


Awarded by Shanghai Pujiang Program


Awarded by National Natural Science Foundation of China


Awarded by Ministry of Education and Science of the Russian Federation


Awarded by Australian Research Council


Funding Acknowledgements

Natural Science Foundation of Shanghai (17ZR1414300), Shanghai Pujiang Program (17PJ1404100), National Natural Science Foundation of China (61675170, 61571298, and 61571289), Ministry of Education and Science of the Russian Federation (14.B25.31.0002), and Australian Research Council (DP140100883).