Silicate glasses have unique properties including high transparency, low temperature sensitivity, and high chemical/electrical resistance. Additive Manufacturing (AM) provides the potential to create parts with complicated geometries over low production volumes as well as opening new possibilities for diverse applications ranging from functionally graded optics to integrated lab-on-a chip devices. This presentation describes ongoing work printing optically transparent glass using a new laser-heated, filament-fed process. A CO2 laser is used to locally melt, continuously fed, small-diameter glass rods and fiber. 3D shapes are constructed by moving a 4-axis CNC stage relative to the intersection of the filament and the laser beam. Material consolidated by the melting process, solidifies out of the melt pool as the part translates relative to the laser beam allowing the deposition of free-standing transparent structures. Research towards the large-area low-cost fabrication of metasurfaces will also be presented. Microsphere Photolithography (MPL) is a practical, cost-effective nanofabrication technique. It uses self-assembled lattice microspheres in contact with a photoresist layer as an optical element. The microspheres focus incident light to a sub-diffraction array of photonic jets in the photoresist. A wide range of structures can be deposited on non-planar substrates. Work depositing functional metasurfaces will be presented including designs to control the emission of thermal radiation and index of refraction sensing on the tip of an optical fiber. Finally, effort to scale-up both processes will be described.
Edward Kinzel received his B.S., M.S. and Ph.D. in Mechanical Engineering from Purdue University in 2003, 2005, and 2010, respectively. His graduate work was focused on laser-based micro/nano fabrication including Laser Forward Transfer and Selective Laser Sintering of electronics as well as near-field direct-write nanolithography with sub-100 nm resolution. Following PhD, he was a postdoc in the Infrared Systems Laboratory (UCF: CREOL/UNCC) focusing on the design and application IR antennas, FSS/metasurfaces and their observation with Near Field Scanning Optical Microscopy. From 2012-2019 he was and was an Assistant/Associate Professor at the Missouri University of Science and Technology. In 2019, he joined the faculty of the Aerospace and Mechanical Engineering department at the University of Notre Dame. Dr. Kinzel’s current research includes practical nanofabrication of FSS/metasurfaces for controlling thermal transport, additive manufacturing of glass for optical applications, and applying FSS/metasurfaces as well as IR/optical antennas as sensing elements and for energy harvesting. Dr. Kinzel is a member of ASME, SPIE, and IEEE and has authored/co-authored over 40 journal papers.
Seminar sponsored by the Department of Electrical Engineering