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arXiv physics/0411070physics.opticscond-mat.mtrl-sci
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二聚体阵列中强耦合金属纳米粒子的光学响应

Optical response of strongly coupled metal nanoparticles in dimer arrays

J. J. Xiao, J. P. Huang, K. W. Yu

摘要:

从理论上研究了浸没在玻璃基质中的贵金属纳米颗粒二聚体结构阵列的光学响应,最近的实验观察到的银阵列中的表面等离子体激元带的分裂的动机。为了捕捉两个接近的粒子之间的强电磁耦合的银二聚体,光谱表示的多重图像公式已被使用,并采用半经典描述的银介电函数从文献中。研究发现,入射的纵向和横向偏振光的等离子体共振带的分裂强烈地依赖于颗粒的直径和它们之间的分离。我们的结果与最近的实验观察相一致。此外,大的红移的纵向偏振可以再现。进一步计算了二聚体阵列稀悬浮液的反射率谱。

英文摘要:

The optical responses of structured array of noble-metal nanoparticle dimers immersed in a glass matrix are investigated theoretically, motivated by the recent experimental observation of the splitting of the surface plasmon bands in silver arrays. To capture the strong electromagnetic coupling between the two approaching particles in a silver dimer, the spectral representation of the multiple image formula has been used, and a semiclassical description of the silver dielectric function is adopted from the literature. The splitting of plasmon resonance band of the incident longitudinal and transverse polarized light is found to be strongly dependent on the particle diameter and their separation. Our results are shown in accord with the recent experimental observation. Moreover, a large redshift for the longitudinal polarization can be reproduced. The reflectivity spectrum is further calculated for a dilute suspension of dimer arrays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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