Near-field properties of a shell nanocylinder pair with gain materials

We study the near-field response of a shell nanocylinder pair, with its core filled by gain materials, using a two- dimensional finite-difference time-domain method. It is shown that the gain materials in the core of the cylinder can compensate for the intrinsic absorption of the metal shell, leadin...

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Bibliographic Details
Published in:Chinese physics B 2012-11, Vol.21 (11), p.388-392
Main Author: 王乔 吴世法 王晓钢
Format: Article
Language:English
Subjects:
Coefficients
Cylinders
Finite difference method
Gain
Mathematical analysis
Metal shells
Nanostructure
Two dimensional
增益系数
局部场
有限差分时域法
材料填充
电场分布
相互作用
近场特性
金属壳
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Summary:We study the near-field response of a shell nanocylinder pair, with its core filled by gain materials, using a two- dimensional finite-difference time-domain method. It is shown that the gain materials in the core of the cylinder can compensate for the intrinsic absorption of the metal shell, leading to local-field enhancement in the gap of the active pair. A linear dependence is found between the field enhancement and the gain coefficient at resonance. The detailed physics is studied by calculating the electrical-field distribution of the shell pair filled with different gain materials. The influence of the gap width and the shell thickness on the interaction of two adjacent active shell cylinders is also investigated.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/11/117302