| 金纳米棒状微粒的胶囊模型及吸收光谱 |
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| 引用本文： | 杨杨,颜丙海,王永昌. 金纳米棒状微粒的胶囊模型及吸收光谱[J]. 光子学报, 2005, 34(3): 375-378 |
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| 作者姓名： | 杨杨 颜丙海 王永昌 |
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| 作者单位： | 西安交通大学理学院现代物理研究所,西安,710049;西安交通大学理学院现代物理研究所,西安,710049;西安交通大学理学院现代物理研究所,西安,710049 |
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| 基金项目： | 国家自然科学基金资助项目(No.60277003) |
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| 摘 要： | 提出了金纳米棒状微粒的胶囊模型，用Waterman发展的T矩阵方法计算了金纳米棒状微粒的吸收光谱.计算谱和实验谱基本符合，520 nm左右处的吸收峰对应于金纳米棒的横向表面等离体子共振（横模），长波长处的吸收峰对应于金纳米棒的纵向表面等离体子共振（纵模）.随着金纳米棒纵横比的增加，纵模吸收峰表现出显著的红移，横模吸收峰则微弱地蓝移.此外，计算结果表明，金纳米棒状微粒外部介质的介电常数必须随着金纳米棒纵横比的增大非线性地减小.
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| 关 键 词： | 金纳米棒状微粒 胶囊模型 吸收光谱 等离体子共振 |
| 收稿时间： | 2004-01-09 |
| 修稿时间： | 2004-01-09 |
Capsule Model and Absorption Spectra of Gold Nanorods |
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| Yang Yang,Yan Binghai,Wang Yongchang. Capsule Model and Absorption Spectra of Gold Nanorods[J]. Acta Photonica Sinica, 2005, 34(3): 375-378 |
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| Authors: | Yang Yang Yan Binghai Wang Yongchang |
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| Affiliation: | Institute of Modern Physics, School of Science, Xi′an Jiaotong University, Xi′an 710049 |
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| Abstract: | Capsule model of gold nanorods is put forward and absorption spectra are calculated using T-matrix method developed by Waterman. Experimental spectra and calculated spectra agree well. The absorption maximum at around 520 nm is corresponding to the transverse surface plasmon resonance (transverse mode), while the absorption maximum at longer wavelength is corresponding to the longitudinal surface plasmon resonance (longitudinal mode). The absorption maximum of longitudinal mode red-shifts significantly with increasing aspect ratio of gold nanorods, while the absorption maximum of transverse mode blue-shifts slightly. Besides, calculations show that the medium dielectric constants decrease nonlinearly with increasing aspect ratio of gold nanorods. |
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| Keywords: | Gold nanorods Capsule model Absorption spectra Plasmon resonance |
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