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Angular-momentum selectivity and asymmetry in highly confined wave propagation along sheath-helical metasurface tubes

机译:沿着鞘螺旋螺旋螺旋形状管的高度限制波传播的角动量选择性和不对称性

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摘要

Highly confined surface waves present unique opportunities to enhance light interactions with localized emitters or molecules. Hyperbolic dispersion in metasurfaces allows us to tailor and manipulate surface waves, enhancing the local density of states over broad bandwidths. So far, propagation on this platform was mainly studied in planar geometries, which facilitates the analysis but somehow limits the realm of possibilities. Here we show that "wrapping" hyperbolic metasurfaces into tubes may greatly enrich the wave propagation dynamics along their axis. This system shows strong interaction with fields and sources carrying optical angular momentum and pronounced field asymmetries, and opens pathways to valley-specific excitation and routing. In addition, we demonstrate that various parameter regimes enable strong spin/helicity momentum locking.
机译:高度限制的表面波提高了与局部发射器或分子的光相互作用的独特机会。 Metasurfaces中的双曲分散允许我们定制和操纵表面波,增强宽带带宽的局部密度。到目前为止,在平面几何形状中研究了这个平台上的传播,促进了分析,但不知何故限制了可能性的领域。在这里,我们认为将“将”双曲形元件沿其轴线大大丰富了波传播动态。该系统显示出与携带光学角动量和明田不对称的田间和源的强烈互动,并打开谷特异性励磁和路由的途径。此外,我们证明了各种参数制度能够实现强旋转/螺旋动量锁定。

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  • 来源
    《Physical review》 |2019年第15期|155425.1-155425.7|共7页
  • 作者

    Mazor Yarden; Alu Andrea;

  • 作者单位

    Univ Texas Austin Dept Elect & Comp Engn Austin TX 78712 USA;

    Univ Texas Austin Dept Elect & Comp Engn Austin TX 78712 USA|CUNY Adv Sci Res Ctr Photon Initiat New York NY 10031 USA|CUNY Grad Ctr Phys Program New York NY 10026 USA|CUNY Dept Elect Engn New York NY 10031 USA;

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