Dynamic switching from coherent perfect absorption to parametric amplification in a nonlinear spoof plasmonic waveguide

Wen Yi Cui, Jingjing Zhang (), Yu Luo (), Xinxin Gao and Tie Jun Cui ()
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Wen Yi Cui: Southeast University
Jingjing Zhang: Southeast University
Yu Luo: Nanjing University of Aeronautics and Astronautics
Xinxin Gao: City University of Hong Kong
Tie Jun Cui: Southeast University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Coherent perfect absorption (CPA) and amplification of electromagnetic waves are converse phenomena, where incoming radiations are coherently dissipated or amplified by structured incidences. Realizing such two phenomena simultaneously in a single device may benefit various applications such as biological sensing, photo detection, radar stealth, solar-thermal energy sharing, and wireless communications. However, previous experimental realizations of CPA and amplification generally require precise controls to the loss and gain of a system, making dynamic switching between the absorption and amplification states a challenge. To this end, we propose a nonlinear approach to realize CPA and parametric amplification (PA) simultaneously at the same frequency and demonstrate experimentally dynamic switch from the CPA to PA states in a judiciously designed nonlinear spoof plasmonic waveguide. The measured output signal gain can be continuously tuned from −33 dB to 22 dB in a propagation length of 9.2 wavelengths. Compared to the traditional linear CPA, our approach relaxes the stringent requirements on device dimensions and material losses, opening a new route to actively modulate the electromagnetic waves with giant amplification-to-absorption contrast in a compact platform. The proposed nonlinear plasmonic platform has potential applications in on-chip systems and wireless communications.

Date: 2024
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DOI: 10.1038/s41467-024-47191-x

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