Investigation of non-spherical core-shell nano particles considering the non-local effect

考虑非局部效应的非球形核壳纳米粒子的研究

• 批准号: 437616189
• 负责人: Dr.-Ing. Thomas Wriedt
• 金额: --
• 依托单位: Fachgebiet Mechanische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/437616189?language=en
• 关键词: Investigation; non; spherical; core; shell

In this proposal, we are concerned with development of an electromagnetic model for the optical properties of non-spherical core-shell nanoparticles. Such particles provide great flexibility in tuning plasmon resonances, as well as in realizing amplification of electromagnetic fields. Core-shell particles constructed from composite nanomaterials have emerged as valuable nanomaterials for catalysis, sensors, photothermal enhancement, and solar cell elements. If the size of the particles is smaller then 10nm classical descriptions of the behavior of the electromagnetic field become insufficient, and quantum-mechanical effects, such as the non-local and the tunneling effect have to be taken into account in the theory.The objective of this project is to develop and test a non-local electromagnetics model for core-shell nanoparticles deposited on a layered substrate such that we can investigate the near field enhancement factor and the plasmon resonance shift and damping of such structures. We intend to make a generalization of the "Discrete Sources Method" including the "Generalized Nonlocal Optical Response" model. We are going to apply lowest order distributed multipoles together with the "Generalized Point Matching" technique as a basic numerical scheme for computation of the multipole amplitudes. Another issue consists in the accounting for the influence of the glass prism the 3D resonators are deposited on. For this problem, it is possible to use the approach we have already employed to consider different "Total Internal Reflection Microscopy" schemes. This extension requires implementing the Green Tensor of the layered structure to take into account the complete electromagnetic interaction of the core-shell particle with the plane interface. This generalized scheme enables to consider core-shell particles with non-local effect deposited in an evanescent field, which can provide an additional opportunity to increase the enhancement factor of the field intensity near a 3D core-shell resonator.

在这个建议中，我们关注的是非球形核壳纳米粒子的光学性质的电磁模型的发展。这种粒子在调谐等离子体共振以及实现电磁场放大方面提供了很大的灵活性。由复合纳米材料构建的核壳颗粒已经成为催化、传感器、光热增强和太阳能电池元件的有价值的纳米材料。如果粒子的尺寸小于10 nm，则电磁场行为的经典描述变得不足，并且量子力学效应，本项目的目标是建立和测试一个非局域电磁场模型，壳纳米颗粒沉积在层状衬底上，使得我们可以研究近场增强因子和等离子体共振位移和阻尼这样的结构。 我们打算推广“离散源方法”，包括“广义非局部光学响应”模型。我们将应用最低阶分布多极子与“广义点匹配”技术作为计算多极子振幅的基本数值方案。另一个问题是考虑3D谐振腔所在的玻璃棱镜的影响。对于这个问题，可以使用我们已经采用的方法来考虑不同的“全内反射显微镜”方案。这种扩展需要实现分层结构的绿色张量，以考虑核壳粒子与平面界面的完整电磁相互作用。这种广义的计划，使考虑核-壳粒子与非局部效应沉积在倏逝场，这可以提供一个额外的机会，以增加附近的3D核-壳谐振器的场强增强因子。