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

doi:10.1088/1674-1056/21/11/117302

中国物理B ›› 2012, Vol. 21 ›› Issue (11): 117302-117302.doi: 10.1088/1674-1056/21/11/117302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

王乔^a, 吴世法^a, 王晓钢^{a b}

a MOE Key Laboratory of Materials Modification by Beams, School of Physics & Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China;
b State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China

收稿日期:2012-04-25 修回日期:2012-07-02 出版日期:2012-10-01 发布日期:2012-10-01
基金资助:
Project support by the National Natural Science Foundation of China (Grant Nos. 10975012 and 11074029).

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

Wang Qiao (王乔)^a, Wu Shi-Fa (吴世法)^a, Wang Xiao-Gang (王晓钢 )^{a b}

a MOE Key Laboratory of Materials Modification by Beams, School of Physics & Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China;
b State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China

Received:2012-04-25 Revised:2012-07-02 Online:2012-10-01 Published:2012-10-01
Contact: Wang Xiao-Gang E-mail:xgwang@pku.edu.cn
Supported by:
Project support by the National Natural Science Foundation of China (Grant Nos. 10975012 and 11074029).

摘要/Abstract

摘要： 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 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.

关键词: shell nanocylinder pair, gain material, local-field enhancement

Abstract: 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 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.

Key words: shell nanocylinder pair, gain material, local-field enhancement

中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

73.20.Mf

71.45.Gm (Exchange, correlation, dielectric and magnetic response functions, plasmons) 02.70.Bf (Finite-difference methods)

王乔, 吴世法, 王晓钢 . Near-field properties of a shell nanocylinder pair with gain materials[J]. 中国物理B, 2012, 21(11): 117302-117302.

Wang Qiao (王乔), Wu Shi-Fa (吴世法), Wang Xiao-Gang (王晓钢 ). Near-field properties of a shell nanocylinder pair with gain materials[J]. Chin. Phys. B, 2012, 21(11): 117302-117302.

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

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

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