Fig. 1. Geometrical structure of the symmetric Au nanorod trimer structure.对称金纳米棒三聚体结构的模型示意图

Fig. 2. Scattering and absorption spectra of a single gold nanorod trimer. Insets show the calculated electric field and current density vector distributions across the central cross section of the nanorod trimer at the indicated resonances.金纳米棒三聚体的散射谱和吸收谱, 插图为在两个散射共振峰位971, 1319和共振谷1229 nm处的纳米结构截面电场和电流密度矢量分布

Fig. 3. Scattering spectra of the nanorod trimer versus the length of center nanorod L_i. Insets show the calculated electric field, magnetic field in the z-direction and current density vector distributions at the indicated resonances. 金纳米棒三聚体的散射谱随中间短棒变化的关系, 插图为在指定频率处的纳米结构截面电磁场和电流密度矢量分布

Fig. 4. Scattering spectra of the nanorod trimer versus the length of side nanorod L_o. Insets show the calculated electric field, magnetic field in the z-direction and current density vector distributions at the indicated resonances. 金纳米棒三聚体的散射谱随边棒变化的关系, 插图为在指定散射共振峰位处的纳米结构截面电磁场和电流密度矢量分布

Fig. 5. Scattering spectra of the nanorod trimer versus the nanorod length with constant displacement ΔL = 100 nm. Insets show the calculated electric field, magnetic field in the z-direction and current density vector distributions at the indicated resonances. 金纳米棒三聚体的散射谱随三棒尺寸变化的关系, 插图为在指定散射共振峰位处的纳米结构截面电磁场和电流密度矢量分布

Fig. 6. Scattering spectra of the nanorod trimer versus inter-rod spacing d. Insets show the calculated electric field and current density vector distributions at the indicated resonances. 金纳米棒三聚体的散射谱随棒间距变化的关系, 插图为在指定散射共振峰位处的纳米结构截面电场和电流密度矢量分布

Fig. 7. Scattering spectra of the nanorod trimer with different media in the gaps between the center and side nanorods. Insets show the calculated electric field, magnetic field in the z-direction and current density vector distributions at the indicated resonances. 当短棒与边棒的间隙内介电环境变化时, 金纳米棒三聚体的散射谱随介质折射率变化的关系, 插图为在两个散射共振峰位处的纳米结构截面电磁场和电流密度矢量分布