TY - JOUR
T1 - Coherent Control of Wave Beams Via Unidirectional Evanescent Modes Excitation
AU - Zhong, Shuomin
AU - Wang, Xuchen
AU - Tretyakov, Sergei A.
N1 - 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.
PY - 2023/11/23
Y1 - 2023/11/23
N2 - 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.
AB - 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.
KW - coherent control
KW - coherent perfect absorption
KW - evanescent waves
KW - gradient metasurfaces
KW - inverse designs
UR - http://www.scopus.com/inward/record.url?scp=85165038099&partnerID=8YFLogxK
U2 - 10.1002/adfm.202304300
DO - 10.1002/adfm.202304300
M3 - Article
AN - SCOPUS:85165038099
SN - 1616-301X
VL - 33
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 48
M1 - 2304300
ER -