• Photonics Research
  • Vol. 9, Issue 5, 726 (2021)
He Wang1、2、†, Yao Jing1、†, Yongfeng Li1、3、4, Lingling Huang2、*, Maochang Feng1, Qi Yuan1, Jiafu Wang1, Jieqiu Zhang1, and Shaobo Qu1
Author Affiliations
  • 1Department of Basic Sciences, Air Force Engineering University, Xi’an 710051, China
  • 2School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 3State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
  • 4e-mail: liyf217130@126.com
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    DOI: 10.1364/PRJ.422509 Cite this Article Set citation alerts
    He Wang, Yao Jing, Yongfeng Li, Lingling Huang, Maochang Feng, Qi Yuan, Jiafu Wang, Jieqiu Zhang, Shaobo Qu. Spin-selective corner reflector for retro-reflection and absorption by a circular dichroitic manner[J]. Photonics Research, 2021, 9(5): 726 Copy Citation Text show less

    Abstract

    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.
    Ei=E02eikzziωt(x^y^)(1±i),

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    Er=RlinEi=(rxxrxyryxryy)Ei,

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    Rlin=eiγ2(1ii1),

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    {θr=arcsin(kisinθicosφi+ϕx)2+(kisinθisinφi+ϕy)2kiφr=arctankisinθisinφi+ϕykisinθicosφi+ϕx,

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    {ϕx=2kisinθicosφiϕy=2kisinθisinφi.

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    R=Dα1RlinDα,withDα=(cosαsinαsinαcosα),(A1)

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    sinα(rxy+ryxryyrxxryyrxxrxyryx)=0,(A2)

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    R=Ax1Dα1RlinDαAx,withAx=(1001),(A3)

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    sin(2α)(rxxryy)+2cos(2α)rxy=0,(A4)

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    He Wang, Yao Jing, Yongfeng Li, Lingling Huang, Maochang Feng, Qi Yuan, Jiafu Wang, Jieqiu Zhang, Shaobo Qu. Spin-selective corner reflector for retro-reflection and absorption by a circular dichroitic manner[J]. Photonics Research, 2021, 9(5): 726
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