期刊
ADVANCED OPTICAL MATERIALS
卷 9, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100190
关键词
chirality; Janus metasurface; retroreflector; reverser; spin wave control; wavelength‐ direction multitasking
资金
- National Defense Foundation of China [2019-JCJQ-JJ-081]
- Youth Talent Lifting Project of the China Association for Science and Technology [17-JCJQ-QT-003]
- Key Program of Natural Science Foundation of Shaanxi Province [2020JZ-33]
- Key Principal's Fund of Air Force Engineering University [XNLX19030601]
- National Key Research and Development Program of China [2017YFA0700202]
- National Natural Science Foundation of China [61701082]
A new triple-layer wavelength-direction multitasking scheme is proposed for wide-angle and large-capacity direction-of-arrival control, utilizing anisotropic sub-meta-atoms to achieve multi-channel rotation and high-efficiency insulation. Two proof-of-concept metadevices are designed to demonstrate the efficiency of the functions designed in six channels.
The fruitful progress toward light manipulation in reflective (R) or transmissive (T) geometry (half-space) has facilitated strong aspiration towards full-space wave control. Although R-T synergistic strategy promises large-capacity and integrated functionality, it imposes difficulty and challenges for direction of arrival (DoA) in full space via an ultrathin flat device. As of today, very limited demonstrations are reported for single-wavelength and linear-polarization operation in full space, significantly limiting the exploitable degrees of freedom (DoFs) for real-world applications. Herein, a triple-layer wavelength-direction multitasking scheme for wide-angle and large-capacity DoA is reported, which is pivotal for blind-free radar detection. By engineering two anisotropic sub-meta-atoms with high quality factor and simultaneous in-plane and out-of-plane symmetry breaking, four R and two T spin-conversion channels are achieved in wide-angle operation with high efficiency and insulation. Above features and released DoFs would be extraordinarily beneficial for large-capability and angle-engineered advanced applications. Two proof-of-concept metadevices, i.e., a large-scanning kaleidoscopic-beam generator and a wide-angle reverser for multi-target tracking, are devised to verify the significance. Numerical and experimental results show predesigned functions at six channels with measured efficiency over 75%. The findings in achieving multi-DoF multitasking can stimulate great interest in radar applications with versatile forming beams and multi-channel integration.
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