Paper 13350-7
Paper 13350-7
Fabrication of terahertz meta-optics using ultrashort pulse laser processing (Invited Paper)
27 January 2025 • 2:45 PM - 3:15 PM PST | Moscone South, Room 308 (Level 3)
Abstract
Meta-optics involves controlling electromagnetic wave propagation using structures at or below the wavelength scale. The terahertz frequency region is gaining interest in applications in sensing, imaging, wireless communications, and radio astronomy. Traditional lithography, used to create these microstructures, requires multiple devices and clean-room environments, which are costly and struggle with non-uniform heights. As an alternative, ultra-short pulse laser processing offers a single-equipment solution. This method, using galvanometer mirrors, achieves a beam focus diameter of 10-20 um, smaller than terahertz wavelengths (hundreds of um), enabling the fabrication of sub-wavelength structures for THz meta-optics. We have successfully used femtosecond laser processing to create terahertz meta-lenses demonstrating comparable performance to lithographic methods, as well as anti-reflection moth-eye structures. This talk will show these advancements in terahertz meta-optics using ultrashort pulsed lasers.
Presenter
The Univ. of Tokyo (Japan)
Kuniaki Konishi received his B.S. (2001), M.S. (2003), and Ph.D. (2008) degrees from the Department of Applied Physics, University of Tokyo. From 2003 to 2005, he worked as a researcher at NTT Photonics Laboratories, Nippon Telegraph and Telephone Corporation. From 2008 to 2014, he was a Project Assistant Professor at the Photon Science Center, University of Tokyo. From 2014 to 2021, he worked as an Assistant Professor at the Institute for Photon Science and Technology, The University of Tokyo. Since 2021, he has been an Associate Professor at that institute. His main research interests are metamaterials, laser processing, and terahertz spectroscopy.