24 Mar 2021 (Wed)
3:30 – 4:30 pm (HK Time)
Guest Speaker: Prof. Junsuk Rho
Mu-Eun-Jae Endowed Chair Associate Professor
Department of Mechanical Engineering
Department of Chemical Engineering
Pohang University of Science and Technology (POSTECH), Korea
Prof. Rho’s research is focused on developing novel nanophotonic materials and devices based on fundamental physics and experimental studies of deep sub-wavelength light-matter interaction. He has published approximately 150 high impact peer-reviewed journal papers including Nature, Science, Nature Materials, Nature Nanotechnology, Nature Photonics and Nature Communications. He also has presented keynote and invited talks more than 250 times at the world-leading institutes and international conferences / workshops as well as having 4 US patent and 26 Korea patents. He has received honorable awards including the Optical Society of America (OSA) CLEO Milton/Chang Award, the International Society for Optics and Photonics (SPIE) Scholarships (2011 & 2012), etc.
Dielectric metasurfaces for flat optics: wavefront engineering and future display and security applications
Miniaturization is a main stream in modern technology, but reduction of conventional optical components accompanies performance degradation that limits the minimum feature size of optical devices. Metasurfaces that consist of ultrathin subwavelength antenna arrays can be a promising solution because metasurfaces provide an effective way of wavefront engineering without constraints on the device size. Electromagnetic responses of individual building blocks are determined by its geometric configurations, and many kinds of antennas have been explored to clarify the capability of metasurfaces; thereby, it has been verified that dielectric antennas can control amplitude, phase, and even both of them simultaneously.