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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Propagation of surface plasmons in ordered and disordered chains of metal nanospheres
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Propagation of surface plasmons in ordered and disordered chains of metal nanospheres

机译：表面等离激元在金属纳米球的有序和无序链中的传播

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We report a numerical investigation of surface plasmon (SP) propagation in ordered and disordered linear chains of metal nanospheres. In our simulations, SPs are excited at one end of a chain by a near-field tip. We then find numerically the SP amplitude as a function of propagation distance. Two types of SPs are discovered. The first SP, which we call the ordinary or quasistatic, is mediated by short-range, near-field electromagnetic interaction in the chain. This excitation is strongly affected by Ohmic losses in the metal and by disorder in the chain. These two effects result in spatial decay of the quasistatic SP by means of absorptive and radiative losses, respectively. The second SP is mediated by longer range, far-field interaction of nanospheres. We refer to this SP as the extraordinary or nonquasistatic. The nonquasistatic SP cannot be effectively excited by a near-field probe due to the small integral weight of the associated spectral line. Because of that, at small propagation distances, this SP is dominated by the quasistatic SP. However, the nonquasistatic SP is affected by Ohmic and radiative losses to a much smaller extent than the quasistatic one. Because of that, the nonquasistatic SP becomes dominant sufficiently far from the exciting tip and can propagate with little further losses of energy to remarkable distances. The unique physical properties of the nonquasistatic SP can be utilized in all-optical integrated photonic systems.
机译：我们报告了表面等离激元（SP）在金属纳米球的有序和无序线性链中传播的数值研究。在我们的模拟中，SP在链的一端被近场尖端激发。然后，我们在数值上发现SP振幅是传播距离的函数。发现了两种类型的SP。我们称之为普通或准静态的第一个SP是由链中的短距离，近场电磁相互作用介导的。这种激发受到金属中欧姆损耗和链中无序度的强烈影响。这两种效应分别通过吸收损耗和辐射损耗导致准静态SP的空间衰减。第二个SP是由纳米球的更远距离的远场相互作用介导的。我们将此SP称为非常或非准静态。由于相关光谱线的整体重量较小，非准静态SP无法被近场探针有效激发。因此，在较小的传播距离处，该SP由准静态SP主导。但是，非准静态SP受欧姆和辐射损耗的影响要比准静态SP小得多。因此，非准静态SP在远离激励尖端的地方变得足够占优势，并且可以在几乎没有能量损失的情况下传播到明显的距离。非准静态SP的独特物理特性可用于全光集成光子系统。

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