CAREER: Advanced Optical and Electrical Characterization of Novel Van der Waals Heterostructure Materials

非技术描述：随着纳米技术的发展和器件尺寸的缩小，局部光学和电学性质在决定材料功能方面变得越来越重要，特别是对于由不同形状的极小尺寸材料组件堆叠而成的新型材料，通常称为纳米管、纳米线或纳米点。它们的电学和光学性质对杂质和缺陷等局部缺陷很敏感。传统的光谱学技术难以实现纳米分辨率的光谱学成像。该CAREER奖的研究部分侧重于开发与扫描光学显微镜集成的高强度白光光源，以实现纳米级表面特征的全彩成像。光源的小尺寸和强度随距离的快速下降使得高分辨率、高强度和高信噪比记录的测量能够用于探索各种纳米结构材料的光学和电学特性。该项目旨在将研究组成部分与研究生和本科生的各种教育和外展活动相结合。加州大学河滨分校是一所少数族裔服务机构，拥有大量西班牙裔学生，该项目旨在提高女性和代表性不足的少数族裔的参与度。技术描述：近场扫描光学显微镜（NSOM）已经成为突破超分辨率图像衍射极限的有力工具。本项目旨在为新型全彩NSOM开发一种新型高透射率宽带探头，并将其用于研究纳米尺度下范德华（vdW）材料和异质结构材料的局部光学和电学性质。该研究包括vdW异质结构制造、原子力显微镜集成NSOM、扫描隧道显微镜集成NSOM和电输运测量的结合。通过使用这种先进的光学表征工具，研究旨在阐明：(i)在极受限系统中改进的光-物质相互作用；（ii）二维异质结构的光学和电学性质，如石墨烯-二硫化钼异质结构中局域激子或三角子的行为；（iii）等离子体单分散簇与石墨烯单层之间的电耦合；(3)单壁碳纳米管的能带结构分布。研究部分与研究生、本科生和高中生的各种教育和推广活动相结合，其中包括来自代表性不足的少数群体的学生。

Nontechnical Description: With the development of nanotechnology and the shrinkage of device size, local optical and electrical properties are getting increasingly important in dictating the material functionalities, especially for the new class of material that are formed by stacking of material components of extremely small size in different shapes, often called nanotubes, nanowires, or dots. Their electrical and optical properties are sensitive to local imperfections such as impurities and defects. Conventional optical spectroscopy techniques face the difficulty in performing optical spectroscopy imaging with nanometer resolution. The research component of this CAREER award is focused on development of high-intensity, white-light source integrated with a scanning optical microscope to enable full-color imaging of nanoscale surface features. The small size of the light source and its fast decline in intensity over distance enable measurements with high resolution, high intensity and high signal to noise recording for exploring optical and electrical properties of various nanostructured materials. The project aims to integrate research components with various education and outreach activities with graduate and undergraduate students. The University of California at Riverside is a minority serving institution with large Hispanic student population and this project targets at increasing the participation of women and underrepresented minorities. Technical Description: Near-field scanning optical microscopy (NSOM) has been a powerful tool to break the diffraction limit of light for super-resolution images. This project aims to develop a new high-transmittance broad-bandwidth probe for a novel full-color NSOM, and to use it for investigation of the local optical and electrical properties of van der Waals (vdW) materials and heterostructure materials at the nanoscale. The research comprises a combination of vdW heterostructure fabrication, atomic-force-microscopy-integrated NSOM, scanning-tunneling-microscopy-integrated NSOM, and electrical transport measurements. By using this advanced optical characterization tool the research aims to elucidate: (i) the modified light-matter interaction in extremely confined systems; (ii) the optical and electrical properties of two-dimensional heterostructures, such as behavior of localized excitons or trions in graphene-MoS2 heterostructures; (iii) the electrical coupling between plasmonic mono-disperse clusters and graphene monolayer; and (iii) the band structure distributions in individual single-walled carbon nanotubes. The research components are integrated with various education and outreach activities with graduate, undergraduate and high school students, involving students from underrepresented minority groups.