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和等离子体/声子特性之间的关系，这些材料具有光控制（等离子体）和热控制和热管理（声子）新技术的潜力。该研究计划包括两个主要目标：i）发现原子排列在一维（1D）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限制和表面等离子体阻尼的影响，直到原子水平。这项工作将通过调查的一维金纳米线，并从二维层材料（1 T-MoS 2，NbS 2）制造的带。预计这些知识将有助于开发改进的等离子体基催化和高效的光子学应用。ii）发现尺寸、形状、原子尺度特征（边缘、缺陷、界面）在纳米结构（二聚体和界面）的声子性质中的作用，以加深我们对新型材料中光-声子耦合和纳米级热传递的理解。该研究将侧重于分析材料的体和表面声子特性，这些材料具有开发低损耗太赫兹纳米光子学（4 H-SiC，h-BN，alfa-MoO 3）以及热控制和热管理（砷化硼，C-60晶体）的引人注目的特性。我们希望确定的光谱响应的颗粒之间的间隙中的散热，确定的振动模式的空间分布，分析的形状尺寸效应，最大限度地提高纳米级的热发射，并确定在晶体管的接口散热通道。 该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电子显微镜，允许亚埃成像和光谱到红外范围。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/声子响应（通过光谱学）的新信息。 该计划所获得的知识将导致实际应用，如在半导体行业中开发高效的红外探测器和固态晶体管，并最终引发加拿大工业的增长/建立。 申请人在研究主题方面的专业知识得到了持续的国际认可，在国际会议，科学奖项和顶级期刊上作为主要作者发表了几篇邀请演讲。在接下来的5年里，该计划将支持至少3名博士生和先进仪器的大量使用，这些仪器的维护成本很高，但目前与世界上最好的仪器竞争。在该计划的保护伞下，学生们预计将有助于在加拿大建立新的研究领域，产生超越目前情况的知识。

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.