Seminar & Colloquium
[세미나: 6월 4일(화), 오후 1시] Prof. Jeong-Hyun Cho, University of Minnesota
Title
Programmable 3D Self-Assembly for the Realization of 3D Micro and Nano Devices
Speaker
Prof. Jeong-Hyun Cho, Department of Electrical and Computer Engineering, University of Minnesota
* Biography
Jeong-Hyun Cho is an associate professor in the Department of Electrical and Computer Engineering at the University of Minnesota, Twin Cities. He earned his B.S. degree in Control and Instrument Engineering from Hoseo University, South Korea, in 2001. He then obtained his M.S. degree in Engineering and his Ph.D. in Engineering Science from Washington State University, Pullman, in 2004 and 2007, respectively. Following his doctorate, he engaged in postdoctoral research at The Johns Hopkins University between 2008 and 2010 and at The Center for Integrated Nanotechnologies at Los Alamos National Laboratory from 2010 to 2013. Professor Cho has received numerous awards, including the Achievement Award from the Los Alamos National Laboratory in 2011, the NSF CAREER award in 2015, and the Outstanding Advisor Award at the University of Minnesota in 2020. His current research focuses on the development of 3D micro and nano materials and devices through the 3D self-assembly of low-dimensional materials, ranging from 0D to 2D.
* Education
- 2007 Ph.D., Engineering Science, Washington State University, Pullman
- 2004 M.S., Engineering, Washington State University, Pullman
- 2001 B.S., Control and Instrument Engineering, HoSeo University, Asan, South Korea
* Professional Experience
- 2019-present Associate Professor, University of Minnesota, Twin Cities
- 2013-2019 Assistant Professor, University of Minnesota, Twin Cities
- 2008-2010 Postdoctoral Fellow, Johns Hopkins University
| Date | Tuesday, June 4th , 2024
| Time | 13:00 ~
| Venue | 33동 222호 (동부 세미나실)
[Abstract]
It is understood that transforming two-dimensional (2D) micro- and nanostructures on a flat substrate into three-dimensional (3D) structures can unlock new physical and chemical properties. Moreover, applying specific surface patterns to these 3D structures can modify their optical attributes, enabling a range of applications previously unattainable with 2D configurations. Despite the strong interest in developing these 3D micro- and nanostructures, their fabrication at such scales poses significant challenges with conventional lithography techniques. These traditional methods, including electron-beam, photolithography, and nanoimprint lithography, are inherently 2D and hard to realize complex 3D micro- and nanostructures because of their 2D manner. This presentation introduces a programmable 3D self-assembly approach that surpasses the limitations of standard lithographic methods. It employs layer-by-layer top-down and bottom-up processes to produce 3D micro- and nanostructures with tailored surface patterns. Such patterning enhances the functionality of 3D devices, including polyhedral (3D) graphene structures, SERS-based 3D nano sensors, and 3D metamaterials. The 3D graphene nanostructures, in particular, exhibit unique plasmon modes through their in-plane and out-of-plane interactions, which reduce damping and boost the plasmon response beyond what is possible with 2D graphene nanoribbons, leading to highly confined light within a 3D volume. Additionally, the talk will cover electron-beam irradiation-driven self-assembly for sequential origami, which expands the potential of self-assembly techniques. This enables the creation of vertically-aligned 3D micro- and nanostructures from 2D materials, opening new possibilities for creating diverse micro and nanoscale 3D devices.
| Host | 최인석 교수(02-880-1712)