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首页> 外文期刊>Physical review >Asymmetrical excitation of surface plasmon polaritons on blazed gratings at normal incidence
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Asymmetrical excitation of surface plasmon polaritons on blazed gratings at normal incidence

机译:垂直入射在闪耀光栅上的表面等离子体激元的非对称激发

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摘要

We present results of numerical simulations and preliminary experiments to investigate and characterize the effect of asymmetrical coupling of normally incident light to surface plasmon polaritons (SPPs) on metallic blazed gratings. Two types of blazed gratings are investigated, a two-dimensional (2D) area-coded binary grating and a one-dimensional (1D) slanted sinusoidal grating. The 2D blazed grating, which can be fabricated with standard e-beam lithography, is shown to have the same ability as the classical 1D blazed grating to enhance the strength of the -1st(+1st) evanescent order over the +1st(-1st) counterpart, which leads to the asymmetrical excitation of two counterpropagating SPP modes on the grating surface. The 1D blazed grating, as a reference, is also studied experimentally to verify the previous theoretical predictions. In our first experiments, the observed asymmetrical coupling effect is relatively weak compared with the optimal designs due to many practical limitations. However, good agreement between theory and experiment has been obtained, and physical insight concerning the observed SPP coupling phenomena has been gained. Further measures to realize stronger asymmetrical excitation of SPPs on blazed gratings at normal incidence are discussed.
机译:我们提供数值模拟和初步实验的结果,以研究和表征法向入射光对金属闪耀光栅上的表面等离激元极化子(SPP)的不对称耦合的影响。研究了两种类型的闪耀光栅,即二维(2D)区域编码二进制光栅和一维(1D)倾斜正弦光栅。可以用标准电子束光刻技术制造的2D闪耀光栅具有与经典1D闪耀光栅相同的功能,能够在+ 1st(-1st)上增强-1st(+ 1st)渐逝阶的强度。 ),导致光栅表面上两个反向传播的SPP模式的不对称激发。还对1D闪耀光栅进行了实验研究,以验证先前的理论预测。在我们的第一个实验中,由于许多实际限制,与最佳设计相比,观察到的不对称耦合效果相对较弱。但是,理论和实验之间已经取得了良好的一致性,并且获得了有关观测到的SPP耦合现象的物理见解。讨论了在垂直入射时在闪耀光栅上实现更强的SPP非对称激励的进一步措施。

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  • 来源
    《Physical review》 |2009年第3期|035407.1-035407.11|共11页
  • 作者单位

    Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland;

    Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland Department of Precision Instruments, Tsinghua University, Beijing 100084, China;

    Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland;

    Ecole Polytechnique Federate de Lausanne (EPFL), Institute of Microengineering (IMT-OPT), Breguet 2, 2000 Neuchatel, Switzerland;

    Ecole Polytechnique Federate de Lausanne (EPFL), Institute of Microengineering (IMT-OPT), Breguet 2, 2000 Neuchatel, Switzerland;

    Department of Electrical and Computer Engineering, Montana State University, P.O. Box 173780, Bozeman, Montana 59717-3780, USA;

    Ecole Polytechnique Federate de Lausanne (EPFL), Institute of Microengineering (IMT-OPT), Breguet 2, 2000 Neuchatel, Switzerland;

    Department of Precision Instruments, Tsinghua University, Beijing 100084, China;

    Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    collective excitations (including excitons, polarons, plasmons and other charge-density excitations); metals and metallic alloys; gratings;

    机译:集体激发(包括激子;极化子;等离激元和其他电荷密度激发);金属和金属合金;格栅;

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