arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.04822physics.opticscond-mat.mes-hallphysics.chem-ph
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低载流子密度纳米晶体表面等离子体共振中的表面散射和量子尺寸效应

Diffuse Surface Scattering and Quantum Size Effects in the Surface Plasmon Resonances of Low Carrier Density Nanocrystals

R. Carmina Monreal, Tomasz J. Antosiewicz, S. Peter Apell

摘要:

对决定局域表面等离子体共振(LSPR)的物理参数的详细理解对于开发等离子体的新应用是必不可少的。通过在通过掺杂半导体量子点获得的低载流子密度系统中识别LSPR,已经开辟了一个相对较新的研究领域。我们从理论上研究如何扩散表面散射的电子结合量子化的效果,由于尺寸(QSE)的影响的演变的LSPR与这些纳米系统的大小。两个关键参数是给出QSE强度的长度$R_0$和进入漫表面散射的长度尺度中的电子激发的速度$β_T$。虽然QSE本身只产生LSPR能量的蓝移,但漫表面散射机制使能量和线宽都具有随尺寸变化的衰减行为,其特征长度取决于材料参数。因此,在纳米尺度上的LSPR与尺寸的演变是非常依赖于这些长度的大小的关系,我们用几个例子来说明。我们发现的各种行为对于设计基于具有所需性质的杂质半导体纳米结构的等离子体器件可能是有用的。

英文摘要:

The detailed understanding of the physical parameters that determine Localized Surface Plasmon Resonances (LSPRs) is essential to develop new applications for plasmonics. A relatively new area of research has been opened by the identification of LSPRs in low carrier density systems obtained by doping semiconductor quantum dots. We investigate theoretically how diffuse surface scattering of electrons in combination with the effect of quantization due to size (QSE) impact the evolution of the LSPRs with the size of these nanosystems. Two key parameters are the length $R_0$ giving the strength of the QSE and the velocity $β_T$ of the electronic excitations entering in the length scale for diffuse surface scattering. While the QSE itself only produces a blueshift in energy of the LSPRs, the diffuse surface scattering mechanism gives to both energy and linewidth an oscillatory-damped behavior as a function of size, with characteristic lengths that depend on material parameters. Thus, the evolution of the LSPRs with size at the nanometer scale is very dependent on the relation of size to these lengths, which we illustrate with several examples. The variety of behaviors we find could be useful for designing plasmonic devices based on doped semiconductor nano structures having desired properties.

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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