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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Directional excitation of surface plasmon polaritons in structure of subwavelength metallic holes
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Directional excitation of surface plasmon polaritons in structure of subwavelength metallic holes

机译：亚波长金属孔结构中表面等离激元极化子的定向激发

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摘要

In this paper, we propose a structure formed by two subwavelength holes fabricated in a metal film to realize directional excitation of surface plasmon polaritons (SPPs). The holes are employed as SPP sources, and the relative phase of SPPs generated at the hole exit end can be adjusted by changing the dielectric material filled in holes. Using the difference in relative phase values of SPP for two holes filled with different dielectric media, the SPPs can interfere constructively along one direction while destructively along the opposite direction. Our theoretical analysis is verified by the three-dimensional finite-difference time-domain method. Moreover, the directional excitation of SPPs in two-hole array structure is also discussed. It is found that the effect of SPPs directional excitation is improved with the increase of the number of two-hole.
机译：在本文中，我们提出了一种结构，该结构由在金属膜中制造的两个亚波长孔形成，以实现表面等离子体激元（SPPs）的定向激发。空穴被用作SPP源，并且可以通过改变填充在空穴中的介电材料来调整在空穴出口端产生的SPP的相对相位。利用填充有不同介电介质的两个孔的SPP相对相位值的差异，SPP可以沿一个方向进行相长干涉，而沿相反方向进行相消干涉。我们的理论分析得到了三维时域有限差分法的验证。此外，还讨论了两孔阵列结构中SPP的定向激发。研究发现，随着两孔数的增加，SPPs定向激励的效果得到改善。

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