Realization of broadband coherent perfect absorption of spoof surface plasmon polaritons

In this work, we propose and demonstrate a scheme to realize broadband coherent perfect absorption of spoof surface plasmon polaritons (SPPs) using an ultrathin conductive film vertically placed on a plasmonic metasurface that supports spoof SPPs. When the conductive film possesses an appropriate sh...

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Veröffentlicht in:Applied physics letters 2022-04, Vol.120 (17)
Hauptverfasser: Wang, Cong, Shen, Xian, Chu, Hongchen, Luo, Jie, Zhou, Xiaoxi, Hou, Bo, Peng, Ruwen, Wang, Mu, Lai, Yun
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Sprache:eng
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Zusammenfassung:In this work, we propose and demonstrate a scheme to realize broadband coherent perfect absorption of spoof surface plasmon polaritons (SPPs) using an ultrathin conductive film vertically placed on a plasmonic metasurface that supports spoof SPPs. When the conductive film possesses an appropriate sheet resistance, two incident coherent beams of spoof SPP waves can be simultaneously absorbed over a broad spectrum. By tuning the phase difference between the two incident beams from 0 to π, the absorption can be gradually changed from near-100% to near-zero, as verified in full-wave simulations and microwave experiments. Our work extends the theory of coherent perfect absorption from propagating waves to spoof SPPs with a significant advantage of broad working bandwidth.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0089065