TY - JOUR
T1 - Non-Interleaved Bilayer Complex-Amplitude Janus Metasurface Enabling Energy-Tailorable Bidirectional Wave Modulation
AU - Mu, Yongheng
AU - Qi, Jiaran
AU - Xia, Siyu
AU - Li, Li
AU - Sihvola, Ari
N1 - Funding Information:
This paper was supported by the National Natural Science Foundation of China (Grant Nos. 62271170 and 61731007).
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2023/3
Y1 - 2023/3
N2 - Janus metasurfaces have attracted significant attention due to their key feature of asymmetric transmission in numerous practical applications, such as asymmetric data inscription in communications and dual side displays in smart mobile devices. More compact and integrated spatial wave modulation components call for implementations of non-interleaved bilayer complex-amplitude (CA) Janus metasurfaces. Here, by introducing composite geometry phase into propagation phase, direction-dependent decoupling relation between amplitude and phase engineering is derived, and the mechanism of energy-tailorable bidirectional wave modulation is elucidated via extremely simple single-pixeled Janus elements. A non-interleaved bilayer CA Janus metasurface is thus proposed. Bidirectional amplitude-phase profiles with both-transmission (T–T) or transmission–reflection-integration (T–R) operational modes can readily be achieved. Numerical analysis and experimental verification of direction-dependent energy allocation and reciprocal asymmetric holograms are performed to demonstrate the excellent manipulation accuracy and decorrelation under bidirectional illuminations. On this basis, a series of coplanar image syntheses, including frequency–polarization multitasking and T–R dual-channel multiplexing, based on the proposed bidirectional CA modulation mechanism are experimentally demonstrated in the microwave region. This asymmetric transmission mechanism will promote developments of Janus metasurfaces for multichannel processing and information multiplexing applications in miniaturized and highly integrated systems.
AB - Janus metasurfaces have attracted significant attention due to their key feature of asymmetric transmission in numerous practical applications, such as asymmetric data inscription in communications and dual side displays in smart mobile devices. More compact and integrated spatial wave modulation components call for implementations of non-interleaved bilayer complex-amplitude (CA) Janus metasurfaces. Here, by introducing composite geometry phase into propagation phase, direction-dependent decoupling relation between amplitude and phase engineering is derived, and the mechanism of energy-tailorable bidirectional wave modulation is elucidated via extremely simple single-pixeled Janus elements. A non-interleaved bilayer CA Janus metasurface is thus proposed. Bidirectional amplitude-phase profiles with both-transmission (T–T) or transmission–reflection-integration (T–R) operational modes can readily be achieved. Numerical analysis and experimental verification of direction-dependent energy allocation and reciprocal asymmetric holograms are performed to demonstrate the excellent manipulation accuracy and decorrelation under bidirectional illuminations. On this basis, a series of coplanar image syntheses, including frequency–polarization multitasking and T–R dual-channel multiplexing, based on the proposed bidirectional CA modulation mechanism are experimentally demonstrated in the microwave region. This asymmetric transmission mechanism will promote developments of Janus metasurfaces for multichannel processing and information multiplexing applications in miniaturized and highly integrated systems.
KW - asymmetric transmission
KW - complex amplitude
KW - composite geometric phase
KW - Janus metasurfaces
KW - multitasking
UR - http://www.scopus.com/inward/record.url?scp=85144170230&partnerID=8YFLogxK
U2 - 10.1002/lpor.202200659
DO - 10.1002/lpor.202200659
M3 - Article
AN - SCOPUS:85144170230
SN - 1863-8880
VL - 17
JO - LASER AND PHOTONICS REVIEWS
JF - LASER AND PHOTONICS REVIEWS
IS - 3
M1 - 2200659
ER -