Coherent Control of Wave Beams Via Unidirectional Evanescent Modes Excitation
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-11-23
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Language
en
Pages
10
Series
Advanced Functional Materials
Abstract
Conventional coherent absorption occurs only when two incident beams exhibit mirror symmetry with respect to the absorbing surface, i.e., the two beams have the same incident angles, phases, and amplitudes. This study proposes a more general metasurface paradigm for coherent perfect absorption with impinging waves from arbitrary asymmetric directions. By exploiting excitation of unidirectional evanescent waves, the output can be fixed at one reflection direction for any amplitude and phase of the control wave. It shows theoretically and confirm experimentally that the relative amplitude of the reflected wave can be tuned continuously from zero to unity by changing the phase difference between the two beams, i.e., switching from coherent perfect absorption to full reflection. It hopes that this study will open up promising possibilities for wave manipulation via evanescent waves engineering with applications in optical switches, optical computing, one-side sensing, photovoltaics, and radar cross-section control.Description
Funding Information: The authors are grateful to Dr. Viktar S. Asadchy for useful discussions. S.M.Z. acknowledges support from the China Scholarship Council. This research was also supported by the Natural Science Foundation of Zhejiang Province(LY22F010001), Natural Science Foundation of Ningbo (2022J098), and the Fundamental Research Funds for the Provincial Universities of Zhejiang. Publisher Copyright: © 2023 Wiley-VCH GmbH.
Keywords
coherent control, coherent perfect absorption, evanescent waves, gradient metasurfaces, inverse designs
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Citation
Zhong, S, Wang, X & Tretyakov, S A 2023, ' Coherent Control of Wave Beams Via Unidirectional Evanescent Modes Excitation ', Advanced Functional Materials, vol. 33, no. 48, 2304300 . https://doi.org/10.1002/adfm.202304300
