期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 54, 期 32, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ac04e6
关键词
surface plasmon; nano wire; Helmholtz equation; near field
资金
- GP-Spin at Tohoku University
- JSPS KAKENHI [JP18H01810]
The study optimizes the enhancement of the electric field within a hollow metallic cylinder as a function of the angular frequency of incident light. An empirical formula is obtained to describe the enhancement based on numerical calculations. It is found that maximum enhancement occurs when the induced charge density at the outer surface is minimized, likely due to a linear combination of two intrinsic modes of the cylindrical surface plasmon (SP).
The enhancement of the electric field in a hollow metallic cylinder is optimized as a function of the angular frequency of incident light. A resonant enhancement occurs by exciting azimuthal surface plasmon (SP) and the enhancement is uniform inside the cylinder which is useful for spectroscopy. The enhancement of the electric field is numerically calculated by solving the Helmholtz equation as a function of the inner and outer radii of the cylinder from which an empirical formula for the enhancement is obtained by fitting the numerical results. The maximum enhancement occurs near the resonant condition of the SP but it is not exactly at the resonant frequency of the SP. The calculated induced charge density at the inner and outer surfaces show that the maximum enhancement occurs when the induced charge density at the outer surface becomes minimum. We suggest that such suppression of charge density at the outer boundary of the cylinder is the result of the linear combination of two intrinsic modes of the cylindrical SP.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据