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Functionalized Three-Dimensional (3D) Micro and Nanostructures
时间:2018-12-17 11:00    点击:   所属单位:先进材料与纳米科技学院
讲座名称 Functionalized Three-Dimensional (3D) Micro and Nanostructures
讲座时间 2018-12-18 16:00:00
讲座地点 西安电子科技大学南校区G楼118报告厅
讲座人 Jeong-Hyun Cho
讲座人介绍 Jeong-Hyun Cho received a B.S. degree in control and instrument engineering from Hoseo University, South Korea, in 2001. He received his M.S. degree in engineering and his Ph.D. in engineering science from Washington State University, Pullman, USA, in 2004 and 2007, respectively. He worked at The Johns Hopkins University from 2008 to 2010 and in The Center for Integrated Nanotechnologies at the Los Alamos National Laboratory from 2010 to 2013 as a postdoctoral researcher. He is currently an assistant professor in Electrical and Computer Engineering at University of Minnesota, Twin Cities, where he has been working on the development of 3D multifunctional micro and nanostructures for devices and sensors, using a self-assembly strategy. Professor Cho has been awarded a prestigious 2015 Faculty Early Career Development (CAREER) Award from the National Science Foundation (NSF). He has also received several awards including the Achievement Award at the Los Alamos National Laboratory in 2011.
讲座内容 In order to realize three-dimensional (3D) micro and nano devices, we should be able to pattern metal and/or semiconductor materials on 3D micro and nanostructures. However, it is extremely difficult to make surface patterns on the 3D structures with the use of traditional lithographic tools especially at the nanoscale because traditional lithographic tools, such as electron beam, photolithographic, and nano imprint, are a two-dimensional (2D) manner. This presentation will address a self-assembly strategy which can overcome the limitation of conventional lithographic processes, a layer-by-layer top-down lithographic process, and build 3D micro and nanostructures with desired patterning on the surface of the 3D structures. Surface patterning on the 3D structures can alter the material properties as well as allows building functionalized 3D micro and nano devices such as 3D polyhedral graphene, triaxial optical inclinometers, and isotropic metamaterials. The 3D graphene nanostructures benefit from unique hybridized plasmon modes through in-plane coupling and out-of-plane stacking, inducing simultaneously coupled vertices, edges, surfaces, and volume. The hybridized plasmon modes induced in the 3D graphene nanostructures amplify the limited plasmon response in 2D graphene nanoribbons, generating extreme volumetric light confinement. For the realization of the volumetric light confinement, our study introduces a novel technique that adopts the properties of hollow 3D graphene nanoarchitectures. A versatile origami-inspired self-assembly technique has been implemented to transform 2D graphene into 3D graphene nanostructures with precise control over the geometry and size of the resulting 3D nanostructures. This talk will introduce the self-assembly processes and the physical properties of 3D micro/ nanostructures realized by the assembly.
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