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，特别是对于由极小尺寸的不同形状的材料组分堆叠而成的新材料类别，通常称为纳米管、纳米线或点。它们的电学和光学性质对诸如杂质和缺陷等局部缺陷很敏感。传统的光谱学技术很难实现纳米分辨率的光谱学成像。该职业奖的研究部分集中在高强度白光光源的开发上，该光源与扫描光学显微镜集成在一起，能够对纳米级表面特征进行全色成像。光源的小尺寸和其强度随距离的快速衰减使得能够进行高分辨率、高强度和高信噪比的测量，以探索各种纳米结构材料的光学和电学性质。该项目旨在将研究部分与研究生和本科生的各种教育和外联活动结合起来。加州大学河滨分校是一个为少数族裔服务的机构，有大量拉美裔学生，该项目的目标是增加妇女和代表不足的少数族裔的参与。技术描述：近场扫描光学显微镜(NSOM)已经成为突破光在超分辨率图像中的衍射极限的有力工具。本项目旨在为新型全彩色非自组织光学显微镜研制一种新型的高透过率宽带探头，并利用它在纳米尺度上研究范德华(VDW)材料和异质结材料的局域光电性质。该研究包括VDW异质结制备、原子力显微镜集成的NSOM、扫描隧道显微镜集成的NSOM和电输运测量。通过使用这一先进的光学表征工具，本研究旨在阐明：(I)极端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-MoS2异质结构中的局域激子或三子行为；(Iii)等离子体单分散团簇与石墨烯单分子膜之间的电耦合；以及(Iii)单个单壁碳纳米管中的能带结构分布。研究部分与针对研究生、本科生和高中生的各种教育和外联活动相结合，涉及代表人数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.