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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Numerical Study of Mode Excitation in a Partially Illuminated Silver Rod
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Numerical Study of Mode Excitation in a Partially Illuminated Silver Rod

机译：部分发光银棒中模式激励的数值研究

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Using electrodynamics theory, we numerically demonstrated that when the incident light polarization direction is parallel to a silver rod axis, the modes that are forbidden in a fully illuminated silver rod can be excited when the rod is partially illuminated. The modes are excited due to the symmetry breaking of the rod when it is partially illuminated. They are characterized by the even number of nodes in the excited surface plasmons and quadrupole pattern of the scattered light in the space. These modes are different from the allowed modes in a fully illuminated rod, which shows an odd number of nodes in the excited surface plasmons and a dipole pattern of the scattered light. The conclusion was further supported by the calculation results when the illuminated spot was moved from the rod end to its center and when the illuminated length was varied. We also demonstrated dark modes when the incident light polarization is perpendicular to the rod axis. Contrary to the hypothesis that a dark mode will be an efficient waveguide mode, the dark mode shows very poor waveguide applications when the incident polarization is perpendicular to the rod axis.
机译：使用电动力学理论，我们用数值方法证明了当入射光的偏振方向平行于银棒轴时，当部分发光时，可以激发完全照明的银棒中禁止的模式。当杆部分照明时，由于杆的对称断裂而激发了这些模式。它们的特征是受激表面等离子体激元中的偶数个节点和空间中散射光的四极模式。这些模式与完全照亮的棒中允许的模式不同，该棒显示出激发表面等离激元中的奇数个节点和散射光的偶极子模式。当照明光斑从杆端移动到其中心并且照明长度发生变化时，计算结果进一步支持了该结论。我们还演示了当入射光偏振垂直于棒轴时的暗模式。与暗模式将是有效的波导模式的假设相反，当入射偏振垂直于棒轴时，暗模式显示出非常差的波导应用。

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