IEM Distinguished Lecturers Seminar: Extreme Ultraviolet Metaoptics


Event details

Date 15.03.2024
Hour 13:1514:00
Speaker Prof. Marcus Ossiander,
Graz University of Technology, Graz, Austria / Harvard University, Cambridge, United States
Location Online
Category Conferences - Seminars
Event Language English
The seminar will take place in ELA 1 and will be simultaneously broadcasted in Neuchâtel Campus MC B1 273.

Coffee and cookies will be served from 13:00

Extreme ultraviolet (EUV) light enables attosecond physics and nanoscale semiconductor lithography. Unfortunately, all materials absorb it due to its large photon energy, and no transmissive optics exist. In my talk, I will introduce how we overcome this lack of optical elements using ultrathin metasurfaces. These novel optics comprise millions of high-refractive-index nanopillars on flat substrates. The small extent of these building blocks allows researchers to mold the spatial phase of light on the sub-wavelength scale, an ability that currently revolutionizes the handling of visible light. However, for the EUV spectrum, no high-refractive-index materials exist. I will introduce how holes in silicon can act as guiding structures for EUV light, how we can exploit this fact to create metaoptics for 50-nm radiation, how we manufacture and characterize such elements, and the possible applications enabled by this first universal transmissive optics technology for the EUV. Beyond the spatial phase, metasurfaces can shape the temporal phase of light. We exploit this capability to manufacture metasurfaces with negative group delay dispersion in the visible that compress ultrafast laser pulses in transmission.

Short biography
Marcus Ossiander explores the use of metasurfaces in attosecond microscopy at the Graz University of Technology. His research is funded by an ERC Starting Grant and an FWF Start Grant. Marcus is also a research associate at Harvard University, where he pursued a postdoctoral scholarship with Federico Capasso as an Alexander von Humboldt Foundation Feodor-Lynen Fellow. There, he develops metasurfaces for ultrashort laser pulses and cavity applications. Before, Marcus investigated the attosecond dynamics of carriers in solid-state materials and gases at the Max-Planck Institute of Quantum Optics, working with Ferenc Krausz, Reinhard Kienberger, and Martin Schultze.