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arXiv 0902.1926physics.optics
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表面等离子体傅立叶光学

Surface plasmon Fourier optics

Alexandre Archambault, Tatiana V. Teperik, François Marquier, Jean-Jacques Greffet

摘要:

表面等离子体激元通常被描述为具有复波矢或复频率的表面波。当讨论它们的优点在领域confinment或增强的局域态密度,经常出现的争议,因为结果取决于一个复杂的波矢或复杂的频率的选择。特别是,色散曲线的形状取决于这种选择。在讨论表面等离子体的衍射时,常采用标量近似。在这项工作中,我们使用具有复波矢或复频率的表面波展开,推导出表面等离子体场的两个等效矢量表示。这些表示可用于解释表面波的传播和衍射。它们也可以用来讨论场约束和局域态密度的问题,因为它们与这两个色散关系有着明确的关系。

英文摘要:

Surface plasmons are usually described as surface waves with either a complex wavevector or a complex frequency. When discussing their merits in terms of field confinment or enhancement of the local density of states, controversies regularly arise as the results depend on the choice of a complex wavevector or a complex frequency. In particular, the shape of the dispersion curves depends on this choice. When discussing diffraction of surface plasmon a scalar approximation is often used. In this work, we derive two equivalent vectorial representations of a surface plasmon field using an expansion over surface waves with either a complex wavevector or a complex frequency. These representations can be used to account for propagation and diffraction of surface waves. They can also be used to discuss the issue of field confinment and local density of states as they have a non-ambiguous relation with the two dispersion relations.

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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