Electromagnetic Wave Controlling by Atomic-Scale Plasmonics in Nanostructures

在这个项目中，我们将广泛探索原子尺度的等离子体，其中原子现象，如能带结构，晶格缺陷，量子限制和形状/维度效应，最终在小物体中确定电磁波的行为。与大型等离子体器件的研究相比，拟议项目将为探索和控制红外区的电磁波开辟一条新的途径，该区域有望在纳米和生物技术/工业中获得多样化的应用。通过充分利用自上而下和自下而上的纳米结构技术，我们将生产ID，2D和3D图案化的原子尺度低维金属纳米结构，并精确控制缺陷。通过将等离子体激元模制成精确制造的小系统，我们的目标是探索和自由设计用于器件应用的纳米结构的介电和光学特性。对于真正的低维系统，如原子链，几乎没有关于等离子体激元的基础知识，我们将详细探讨这些系统。此外，形状控制的准3D金属纳米粒子阵列（在真空中生长，也在湿化学）具有特殊的技术重要性，但还没有从原子的角度来理解。它们的等离子体共振与巨大的近场增强有关，这使得表面增强红外吸收（SEIRA）成为可能，我们的目标是开发用于生物传感应用以及横向分辨近场红外光谱的超SEIRA活性器件结构。

In this project, we will extensively explore atomic-scale plasmonics where the atomistic phenomena such as the band structure, lattice defects, quantum confinement, and shape/dimensionality effects in ultimately small objects determine the behaviour of the electromagnetic waves. Compared to the researches on the larger-scale plasmonics devices, the proposed project will open up a new route for exploring and controlling the electromagnetic waves in the infrared regime where diversity of application is expected from nano- and bio -technology /industries. By fully utilizing top-down and bottom-up nanofabrication techniques we will produce ID, 2D, and 3D patterned atomic-scale low dimensional metallic na restructure s together with precise controlling of defects. And by molding the plasmons into precisely fabricated small systems, we aim to explore and freely design the dielectric and optical properties of nanostructures for device applications. For the genuine lowdimensional systems such as atom chains, nearly no fundamental knowledge on plasmon is available and we will explore these systems in detail. Also, shape-controlled quasi-3D metal-nanoparticle arrays (grown in ultrahigh vacuum and, also, in wet-chemistry) are of special technological importance but not yet understood from the atomistic point of view. Their plasmon resonances are related to huge nearfield enhancement, which enables surface enhanced IR absorption (SEIRA), and we aim at developing the super-SEIRA-active device structure for the biosensing applications as well as laterally resolved nearfield IR spectroscopy.