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,520nm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。
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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2005年第3期375-378,共4页
Acta Photonica Sinica
基金
国家自然科学基金资助项目(No.60277003)
