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题名:
Numerical study of optical properties of single silver nanobowtie with anisotropic topology
作者: Yang, L.; Du, C.; Luo, X.
刊名: APPLIED PHYSICS B-LASERS AND OPTICS
出版日期: 2008-07-01
卷号: 92, 期号:1, 页码:53-59
文章类型: Article
英文摘要: Optical properties of silver nanobowtie with anisotropic topology, which is separated with nanogap that is horizontal (Y direction) and vertical (Z direction) to the line between the two constituent triangles (i.e., the bowtie axis), are studied. A discrete dipole approximation (DDA) method is used to determine the extinction efficiency and the electric field (E-field) distribution, then the corresponding enhancement factor (EF) and the full width half maximum (FWHM) of the E-field are obtained and analyzed. Our results show that the wavelength of localized surface plasmon resonance (LSPR)-induced blue-shifts and the maximum EF decrease were observed with increasing gap size for the parallel polarized (Z-polarized) excitation. It is also found that the light spot at the "hot spot" in the gap becomes larger and deviates from the rectangular pattern with the increase of the gap in the Z direction (Z-gap), and the FWHM in the Z direction of the localized E-field in the gap broadens with either an increase in the gap in the Y direction (Y-gap) or the Z-gap. These behaviors are due to the decrease of the coupling efficiency of near-field plasmon coupling. In contrast, the wavelength of the LSPR and the maximum EF excited by the perpendicularly polarized (Y-polarized) light show less dependence on the gap size than that of the Y-polarized light.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Optics ; Physics, Applied
研究领域[WOS]: Optics ; Physics
关键词[WOS]: DISCRETE-DIPOLE APPROXIMATION ; NANOPARTICLES ; TRANSMISSION ; ENHANCEMENT ; RESONATOR
收录类别: SCI
语种: 英语
WOS记录号: WOS:000256908600011
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/3642
Appears in Collections:光电技术研究所被WoS收录文章_期刊论文

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作者单位: Chinese Acad Sci, Inst Opt & Elect, State Key Lab Opt Technol Microfabricat, Chengdu 610209, Peoples R China

Recommended Citation:
Yang, L.,Du, C.,Luo, X.. Numerical study of optical properties of single silver nanobowtie with anisotropic topology[J]. APPLIED PHYSICS B-LASERS AND OPTICS,2008,92(1):53-59.
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