arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.05342cond-mat.mtrl-sciphysics.app-phphysics.optics
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工程Au-Ag纳米结构的非常规光学响应

Unconventional Optical Response in Engineered Au-Ag Nanostructures

Dev Kumar Thapa, Subham Kumar Saha, Biswajit Bhattacharyya, Guru Pratheep Rajasekar, Rekha Mahadevu, Anshu Pandey

摘要:

这篇文章描述了由银颗粒嵌入金基质组成的纳米结构的光学性质。在以前的研究中,这些材料被证明表现出温度依赖性的过渡到一个高导电性和强抗磁状态。在这里,我们描述了这些纳米结构的异常光学特性。最值得注意的是,这些材料不遵守米氏理论,并表现出非常规的共振,最大值约为4 eV,而通常的金和银局部表面等离子体共振被抑制。这种效应意味着金和银的体介电函数的显著偏离。我们进一步将这种共振分解为吸收和散射子部分。据观察,共振主要由散射组成,即使在紫外频率下也具有可忽略的损失。

英文摘要:

This article describes the optical properties of nanostructures composed of silver particles embedded into a gold matrix. In previous studies these materials were shown to exhibit temperature dependent transitions to a highly conductive and strongly diamagnetic state. Here we describe the anomalous optical properties of these nanostructures. Most notably, these materials fail to obey Mie theory and exhibit an unconventional resonance with a maximum at about 4 eV, while the usual gold and silver localized surface plasmon resonances are suppressed. This effect implies a significant deviation from the bulk dielectric functions of gold and silver. We further resolved this resonance into its absorbance and scattering sub-parts. It is observed that the resonance is largely comprised of scattering, with negligible losses even at ultraviolet frequencies.

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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