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arXiv 2402.00664physics.optics
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与螺旋等离激元天线耦合的偶极子源的手性和方向性光发射

Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna

Lilli Kuen, Lorenz Löffler, Aleksei Tsarapkin, Lin Zschiedrich, Thorsten Feichtner, Sven Burger, Katja Höflich

AI总结:

本文数值研究了薄膜中偶极子发射器与等离激元单螺旋和双螺旋天线的耦合,采用高阶有限元法计算Purcell增强并分析远场手性与辐射方向图,发现双螺旋在共振激发下具有显著改善的方向性辐射。

摘要:

具有螺旋几何形状的等离激元天线是线偏振偶极子发射与纯圆偏振远场之间的高效换能器。除了大的Purcell增强外,由于其共振模式的几何依赖性,它们还具有宽泛的可调性。本文数值研究了嵌入薄膜中的偶极子发射器与等离激元单螺旋和双螺旋的耦合。采用高阶有限元法(FEM)计算了不同位置和取向的偶极子的波长依赖性Purcell增强,并分析了远场的手性和辐射方向图。单螺旋和双螺旋在共振激发下均表现出高方向性和圆偏振的远场,但双螺旋的方向性辐射显著改善。

英文摘要:

Plasmonic antennas with helical geometry are capable transducers between linearly polarized dipole emission and purely circular polarized far-fields. Besides large Purcell enhancements they possess a wide tunability due to the geometry dependence of their resonant modes. Here, the coupling of a dipole emitter embedded in a thin film to plasmonic single and double helices is numerically studied. Using a higher-order finite element method (FEM) the wavelength dependent Purcell enhancement of a dipole with different positions and orientations is calculated and the far-fields with respect to their chirality and radiation patterns are analyzed. Both single and double helices demonstrate highly directional and circularly polarized far-fields for resonant excitation but with significantly improved directional radiation for the case of double helices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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