Measurements of modal symmetry in subwavelength plasmonic slot waveguides

被引：12

作者：

Spasenovic, M. ^{[1
]}

van Oosten, D. ^{[1
]}

Verhagen, E. ^{[1
]}

Kuipers, L. ^{[1
]}

机构：

[1] FOM Inst Atom & Mol Phys AMOLF, NL-1098 XG Amsterdam, Netherlands

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 20期

关键词：

gold; metallic thin films; optical waveguides; plasmonics; polaritons; surface plasmons; NANOPARTICLES; MODES;

D O I：

10.1063/1.3254246

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We excite a guided plasmonic mode in slot waveguides of subwavelength width. With a phase- and polarization-sensitive near-field microscope, we measure the electric field of the mode for a range of slot widths from 40 to 120 nm. The field is experimentally found to be antisymmetric across the slot gap. Numerical calculations confirm this symmetry. Calculations also show a confinement of the field to a lateral size similar to 10 times smaller than the free-space wavelength.

引用

页数：3

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