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arXiv 0908.3707physics.opticsphysics.comp-ph
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等离子体激元系统的材料设计

Designing materials for plasmonic systems

Martin G. Blaber, Matthew D. Arnold, Michael J. Ford

摘要:

我们利用基于密度泛函理论的电子结构计算,在碱金属贵金属间化合物中寻找理想的等离子体材料。重要的是,我们使用密度泛函微扰理论来计算电子-声子相互作用,并从那里使用一阶的玻尔兹曼方程的解来估计Drude介电函数的现象阻尼频率。我们讨论了等离子体激元材料的必要的电子特性,并研究了碱-贵金属间化合物的光学性质的一些通用的等离子体激元系统的品质因数。我们得出结论,在低的负折射率,KAu与0.0224 eV的阻尼频率和高的光学间隙裸等离子体频率比,优于金,并在一定程度上银作为等离子体材料。不幸的是,低等离子体频率(1.54eV)降低了其在现代等离子体应用中的实用性。我们还简要地讨论了局部场对这些材料的光学性质的影响。

英文摘要:

We use electronic structure calculations based upon density functional theory to search for ideal plasmonic materials among the alkali noble intermetallics. Importantly, we use density functional perturbation theory to calculate the electron-phonon interaction and from there use a first order solution to the Boltzmann equation to estimate the phenomenological damping frequency in the Drude dielectric function. We discuss the necessary electronic features of a plasmonic material and investigate the optical properties of the alkali-noble intermetallics in terms of some generic plasmonic system quality factors. We conclude that at low negative permittivities, KAu with a damping frequency of 0.0224 eV and a high optical gap to bare plasma frequency ratio, outperforms gold and to some extent silver as a plasmonic material. Unfortunately, a low plasma frequency (1.54 eV) reduces its utility in modern plasmonics applications. We also discuss, briefly, the effect of local fields on the optical properties of these materials.

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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