期刊
ANNALEN DER PHYSIK
卷 532, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/andp.201900472
关键词
coding metasurfaces; dual-channel wavefront; spin-decoupled metasurfaces; ultrawide frequency band
资金
- National Natural Science Foundation of National Natural Science Foundation of China (NSFC) [61671231, 61871394]
- National Key Research and Development Program of China [2017YFA0700201]
Achieving distinct functionalities for electromagnetic (EM) waves with opposite handedness in a broad frequency range is highly desirable and essential for modern wireless communications and radar stealth. However, available functional meta-devices still suffer from the issues of locked functionalities or spin-decoupled properties but with limited bandwidth. Here, a spin-decoupled coding metasurface is presented for achieving independently spin-controlled functionalities with high efficiency in an ultrawide frequency band. By synthesizing the Jones matrix, it is predicted that two half-wave plates with a phase difference of 90 degrees can form a 1-bit coding metasurface operating for orthogonal spins independently. As proofs of concept, two meta-devices are implemented by the metasurface in the microwave region. The first meta-device performs as a spin-decoupled beam deflector while the second one shows an ability to generate spin-decoupled multi-beams carrying desired orbital angular momentums. Both of the designed meta-devices can operate in the whole band of 7.5-18.5 GHz (with relative bandwidth of 80%), which, to the best knowledge, is so far the broadest bandwidth that can be achieved by spin-decoupled metasurfaces. This may trigger interest and open opportunities for advanced functional meta-devices in practical applications, for example, multichannel metasurface antennas, or multifunctional low-scattering devices in microwave region.
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