Tunable microwave metasurfaces for high-performance operations: dispersion compensation and dynamical switch.
Tunable microwave metasurfaces for high-performance operations: dispersion compensation and dynamical switch.
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用于高性能操作的可调谐微波超表面:色散补偿和动态开关
DOI:
10.1038/srep38255
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发表时间:
2016-11-30
影响因子:
4.6
通讯作者:
Zhou L
中科院分区:
文献类型:
--
作者:
Xu HX;Tang S;Ma S;Luo W;Cai T;Sun S;He Q;Zhou L
Controlling the phase distributions on metasurfaces leads to fascinating effects such as anomalous light refraction/reflection, flat-lens focusing, and optics-vortex generation. However, metasurfaces realized so far largely reply onpassive resonantmeta-atoms, whoseintrinsic dispersionslimit suchpassivemeta-devices’ performances at frequencies other than the target one. Here, based ontunablemeta-atoms with varactor diodes involved, we establish a scheme to resolve these issues for microwave metasurfaces, in which the dispersive response of each meta-atom is precisely controlled by an external voltage imparted on the diode. We experimentally demonstrate two effects utilizing our scheme. First, we show that atunablegradient metasurface exhibitssingle-mode high-efficiencyoperation within a wide frequency band, while its passive counterpart only works at a single frequency but exhibits deteriorated performances at other frequencies. Second, we demonstrate that the functionality of our metasurface can be dynamically switched from a specular reflector to a surface-wave convertor. Our approach paves the road to achieve dispersion-corrected and switchable manipulations of electromagnetic waves.
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