Light in a subwavelength slit in a metal: Propagation and reflection

被引：203

作者：

Gordon, R ^{[1
]}

机构：

[1] Univ Victoria, Dept Elect & Comp Engn, Victoria, BC V8W 3P6, Canada

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.73.153405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The propagation and reflection of TM light in a subwavelength slit in a real metal are analyzed. The results for the real metal differ significantly from that of a perfect electric conductor due to the existence of surface plasmons. As the slit becomes narrower or the relative permittivity of the metal becomes less negative, the effective index of the mode in the slit increases and the amplitude and phase of the reflection of the mode at the free-space boundary are modified. To see the influence of these changes for the real metal, it is shown that significant changes in the film thickness, greater than a factor of 2 for noble metals in the visible spectrum and 20-nm slits, are required to maintain the Fabry-Perot resonance at a constant wavelength as the relative permittivity is varied.

引用

页数：3

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