"Electromagnetic methods for some gratings with extreme optogeometrical parameters" by Prof. Evgeny Popov (Aix-Marseille Universite, Institut Fresnel, France)
Date: Monday February 12th 2018
Time : 14:00
Location : Zuidhorst 286
Hosted by Prof. Dr. Fred Bijkerk (The Industrial Focus Group XUV Optics /TNW).
A short review of several different electromagnetic spectral methods for modelling light diffraction by single or periodically arranged dielectric or metallic objects is proposed in view of studying systems having extreme optogeometrical parameters. The first example represents a three-segment 1D diffraction grating with length of several hundred wavelength, used as a narrow-band optical filter. The second study covers the plasmonic properties of metallic cones on that presents a giant (10 000 fold) enhancement of the field intensity, compared to the incident field intensity. The third example consists of a 1D echelette metallic grating made of negative-permittivity materials having simple- or hyper-singularity.