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论文类型：期刊论文

发表时间：2012-11-01

发表刊物：CHINESE PHYSICS B

收录刊物：SCIE、EI、ISTIC、Scopus

卷号：21

期号：11

ISSN号：1674-1056

关键字：shell nanocylinder pair; gain material; local-field enhancement

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 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.