A Theoretical Explanation for the Existence of Certain Maxima in the Visible Spectrum Pattern of Wave Scattering from Spherical Metal-Dielectric-Janus Nanoparticles Based on Surface Plasmon Excitation

IF 3.3 4区 物理与天体物理 Q2 CHEMISTRY, PHYSICAL
Maryam Dehdari, Bahram Jazi, Fatemeh Khosravi
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Abstract

In this research, within the visible frequency band region, the scattering phenomenon of plane electromagnetic waves from two-piece nano-spheres, consisting of metal-dielectric (spherical metal-dielectric Janus nanoparticles), will be investigated theoretically. Mie’s theory, which addresses wave scattering from spherical structures, and the point-matching method for solving field equations, are the two main mathematical tools utilized in this work. Simulations have been conducted for objects with several dual combinations of metal-dielectric materials, such as Gold metal paired with dielectrics like Alumina, PVC, Teflon, and Rexolite. This investigation also extends to objects incorporating Silver metal. The diagrams depicting the variations of the scattering cross-section versus wave frequency have been presented. It will be demonstrated that, at certain frequencies, the diagrams of the scattering cross-section exhibit peaks. These peaks indicate the state in which the densities of surface plasmon dipoles at the metal-dielectric boundary have the most significant and optimal response to the presence of an electromagnetic wave. Since the maxima in the scattering cross-section diagram occur at specific frequencies within the visible region, they can be attributed as a reason for the dominant color observed in colloidal solutions containing spherical metal-dielectric Janus nanoparticles.

Abstract Image

基于表面等离子体激发的球形金属-介电-Janus 纳米粒子波散射可见光谱模式中存在某些最大值的理论解释
本研究将在可见光频段内,从理论上研究由金属-电介质(球形金属-电介质 Janus 纳米粒子)组成的两件式纳米球体对平面电磁波的散射现象。米氏理论解决了波从球形结构散射的问题,而解决场方程的点匹配法是这项工作中使用的两个主要数学工具。模拟对象包括几种金属-电介质材料的双重组合,如金属黄金与氧化铝、聚氯乙烯、聚四氟乙烯和雷克索莱特等电介质的搭配。这项研究还扩展到了含有银金属的物体。描述散射截面随波频变化的图表已经呈现。结果表明,在某些频率下,散射截面图会出现峰值。这些峰值表示金属-电介质边界的表面等离子偶极子密度对电磁波的存在具有最显著和最佳响应的状态。由于散射截面图中的最大值出现在可见光区域内的特定频率上,因此可以将其归结为在含有球形金属-介电 Janus 纳米粒子的胶体溶液中观察到主要颜色的原因。
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来源期刊
Plasmonics
Plasmonics 工程技术-材料科学:综合
CiteScore
5.90
自引率
6.70%
发文量
164
审稿时长
2.1 months
期刊介绍: Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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