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Spin-selective corner reflector for retro-reflection and absorption by a circular dichroitic manner

查看全文 作　　者：HE [1,2]WANG;YAO [1]JING;YONGFENG [1,3]LI;LINGLING [2]HUANG;MAOCHANG [1]FENG;QI [1]YUAN;JIAFU [1]WANG;JIEQIU [1]ZHANG;SHAOBO [1]QU 高影响力作者 机构地区：[1]Department of Basic Sciences,Air Force Engineering University,Xi’an 710051,China;[2]School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;[3]State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China高影响力机构 出　　处：《Photonics Research》索引2021年第9卷第5期,共8页高影响力期刊 基　　金：Natural Science Foundation of Shaanxi Province(2020JM-342);Beijing Outstanding Young Scientist Program(BJJWZYJH01201910007022);National Natural Science Foundation of China(61775019,61971435,61971437)。 摘　　要：Recently, we have witnessed an extraordinary spurt in attention toward manipulating electromagnetic waves by metasurfaces. Particularly, tailoring of circular polarization has attracted great amounts of interest in both microwave and optics regimes. Circular dichroism, an exotic chiroptical effect of natural molecules, has aroused discussion about this issue, yet it is still in its infancy. Herein, we initiate circular dichroism followed by controlling spin-selective wavefronts via chiral metasurfaces. An N-shaped chiral resonator loaded with two lumped resistors is proposed as the meta-atom producing an adequate phase gradient. Assisted by the ohmic dissipation of the introduced resistors, the effect of differential absorption provides an auxiliary degree of freedom for developing circularly polarized waves with a designated spin state. A planar corner reflector that can achieve retro-reflection and absorption for right-and left-handed circularly polarized incidence is theoretically simulated and experimentally observed at microwave frequency. Thus, our effort provides an alternative approach to tailoring electromagnetic waves in a circular dichroitic manner and may also find applications in multi-functional systems in optics and microwave regimes. 关 键 词：CIRCULAR ABSORPTION microwave
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