Structural Effects on the Plasmonic and Phononic Properties of Low Dimension Nanostructures

该计划旨在了解纳米材料中原子结构与等离子体激元/声子性质之间的关系，这些材料在光控制(等离子体)、热控制和热管理(声子学)方面显示出新技术的潜力。提出的研究计划包括两个主要目标：i)发现原子排列在一维原子大小的金属结构的等离子体性质中的作用。特别是，分析了原子排列对局域约束和表面等离子体衰减的影响，并深入到原子水平。这项工作将通过研究一维金纳米线和由2D层材料(1T-MoS_2，Nb_2)制成的带来完成。预计这些知识将有助于改进基于等离子激元的催化和高效光子学应用的发展。Ii)揭示尺寸、形状、原子尺度特征(边、缺陷、界面)在纳米结构(二聚体和界面)声子性质中的作用，以加深我们对新型材料中光-声子耦合和纳米尺度热传递的理解。这项研究将集中于对材料的体声子和表面声子性质的分析，这些材料在开发低损耗太赫兹纳米光子学(4H-碳化硅、h-BN、阿尔法-MoO_3)以及用于热控制和热管理(砷化硼、C-60晶体)方面表现出引人注目的性能。我们希望确定粒子间隙中散热的光谱响应，确定振动模的空间分布，分析使纳米级热发射最大化的形状-尺寸效应，并确定晶体管界面处的散热通道。 这项研究将使用加拿大电子显微镜中心的仪器，其中包括最先进的透射式电子显微镜，允许亚埃成像和光谱分析，直到红外范围。这些仪器将以前所未有的空间和能量分辨率提供有关材料结构(通过成像)和等离子体激元/声子响应(通过光谱学)的新信息。 该计划所获得的知识将在半导体行业开发高效红外探测器和固态晶体管等实际应用，并最终推动加拿大工业的发展/建立。 申请者在研究课题上的专业知识通过在国际会议、科学奖项和顶级期刊上作为主要作者的几次受邀演讲而得到持续的国际认可来证明。在接下来的5年里，该计划将支持至少3名博士生和大量使用先进的仪器设备，这些设备的维护成本很高，但目前与世界上最好的设备竞争。在这一计划的框架下，学生们将为加拿大新研究领域的建立做出贡献，产生超出当前情景的知识。

This program aims at understanding the relationship between atomic structure and plasmon/phonon properties in nanoscale materials which exhibit potential for novel technologies in light control (plasmonics), and heat control and thermal management (phononics). The proposed research program includes 2 main objectives: i) To discover the role of the atomic arrangement in the plasmonic properties of one-dimension (1D) atom-sized metal structures. In particular, to analyze the effects of the atomic arrangement on the local confinement and surface plasmon damping, down to the atom level. This work will be done through investigations of 1D gold nanowires, and ribbons fabricated from 2D layer materials (1T-MoS2, NbS2). The knowledge is expected to contribute to the development of improved plasmon-based catalysis and efficient photonics applications. ii) To discover the role of size, shape, atom-scale features (edges, defects, interfaces) in the phonon properties of nanostructures (dimers and interfaces) to deepen our understanding of light-phonon coupling and nanoscale heat transfer in novel materials. The study will be focused on the analysis of bulk and surface phonon properties of materials which exhibit compelling properties for development of low-loss terahertz nanophotonics (4H-SiC, h-BN, alfa-MoO3), and for heat control and thermal management (Boron arsenide, C-60 crystals). We expect to identify the spectral response for heat dissipation in gap between particles, determine the spatial distribution of the vibrational modes, analyze the shape-size effects which maximize nanoscale thermal emission, and determine channels for heat dissipation at interfaces in transistors. The research will use instruments at the Canadian Centre for Electron Microscopy that includes state-of-the-art transmission electron microscopes, allowing sub-Angstrom imaging and spectroscopy down to the infrared range. These instruments will provide new information on structure of materials (via imaging) and plasmon/phonon response (via spectroscopy) at an unprecedented spatial and energy resolution. The knowledge derived by this program will lead to practical applications as development of efficient infrared detectors and solid-state transistors in the semiconductor industry, and ultimately trigger the growth/establishment of industries in Canada. The expertise of the applicant in the research subject is demonstrated by sustained international recognition with several invited talks at international conferences, scientific awards, and publications in top journals as a leading author. Over the next 5 years, this program will support a minimum of 3 PhD students and the significant use of advanced instrumentation, which have high maintenance costs, but are currently competitive with the best in the world. Under the umbrella of this program, the students are expected contribute to the establishment of new research areas in Canada, generating knowledge beyond the current scenario.