ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarMarcus OssianderGraz University of Technology (host: Dombi 
Péter)Metaoptics for Extreme-Ultraviolet and Ultrashort Laser PulsesTuesday, 
23 April 2024, 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference RoomExtreme 
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. Minden érdeklődőt 
szívesen látunk! - Everyone is welcome to attend.Attila Nagysem-admin AT szfki.hu