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共振金属纳米天线近场区域单分子荧光增益性质的研究
  • ISSN号：0479-8023
  • 期刊名称：《北京大学学报：自然科学版》
  • 时间：0
  • 分类：O431[机械工程—光学工程;理学—光学;理学—物理]
  • 作者机构：[1]人工微结构和介观物理国家重点实验室,北京大学物理学院,北京100871
  • 相关基金：国家自然科学基金（10874004,10821062）; 国家重点基础研究发展计划（2007CB307001）资助
作者： 任攀[1], 古英[1]
关键词： 表面等离激元共振, 单分子荧光, 近场增益, 弛豫系数变化, surface plasmon, single molecular fluorescence, near field enhancement, modified decay rates
中文摘要：

从理论上研究了发生表面等离激元共振时,银纳米天线对其周围近场区域单分子荧光性质的影响。最优的荧光增益效果在电场增益率和弛豫系数变化率的比值（即优化系数）较大时发生。通过对优化系数的计算,发现当荧光分子的偶极矩与入射光偏振相同时,并且在距离纳米天线30～100 nm的近场区域内,荧光增益效果最佳。讨论了不同偏振方向荧光分子在天线周围不同距离、不同方向的平面以及入射波长变化时对于荧光性质的影响,可以为金属纳米天线调控荧光行为的实验给予指导。

英文摘要：

The authors theoretically investigated the fluorescence enhancement of single molecules near the resonant silver nano-antenna.The optimal fluorescence effect occurs at the large optimal coefficient,defined by the ratio between the normalized near field and decay rate.It shows that when the polarization of dipoles is parallel to the polarization of incident field and the dipoles are located within the specific nanoregion of 30-100 nm away from the metallic surface,a large fluorescence enhancement is achieved.For the different polarazition of dipoles,the enhancement effects of emission are also discussed at different location of dipoles and different incident wavelength.The results are helpful in the experiment design of single molecular fluorescence near the plasmonic nano-antenna.

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期刊信息
  • 《北京大学学报：自然科学版》
  • 中国科技核心期刊
  • 主管单位:教育部
  • 主办单位:北京大学
  • 主编：赵光达
  • 地址：北京海淀区海淀路52号
  • 邮编：100871
  • 邮箱：xbna@pku.edu.cn
  • 电话：010-62756706
  • 国际标准刊号：ISSN：0479-8023
  • 国内统一刊号：ISSN：11-2442/N
  • 邮发代号:2-89
  • 获奖情况:
  • 1997年第二届全国优秀科技期刊评比一等奖,1999年教育部“优秀自然科学学报一等奖”,1999年获首届国家期刊奖,中国期刊方阵“双高”期刊
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  • 被引量:18270