Seminar 42, Tuesday 18 May 2021, 14:00 (London Time)
Speaker: Pavel Belov (Research Center of Nanophotonics and Metamaterials, Physics and Engineering Department, ITMO University, St. Petersburg, Russia)
Title: Longitudinal electromagnetic waves with extremely short wavelength
Abstract: Elastic waves may have either longitudinal or transverse polarization: the acoustic (compression) waves are longitudinal while the sheer stress waves are usually transverse. The electromagnetic waves are in many aspects similar to the elastic ones. However, the electromagnetic waves in vacuum and most materials have transverse polarization. Longitudinal electromagnetic waves with electric field parallel to wave vector are very rare and appear under special conditions in a limited class of media, for example in plasma.
In this work, we study the dispersion properties of an easy-to-manufacture metamaterial consisting of two three-dimensional cubic lattices of connected metallic wires inserted one into another, also known as an interlaced wire medium. It is shown that the metamaterial supports longitudinal waves at extremely wide frequency band from very low frequencies up to the Bragg resonances of the structure.
The waves feature unprecedentedly short wavelengths comparable to the period of the material.
The revealed effects highlight spatially dispersive response of interlaced wire medium and provide a route toward generating electromagnetic fields with strong spatial variation.
For more details see https://arxiv.org/abs/2103.10205
Biography: Pavel Belov is a Head of Physics and Engineering School, ITMO Univeristy, St. Petersburg, Russia
He defended two PhD theses: one in ITMO University in Russia in 2003 and the second one in Finland in 2006 at the Helsinki University of Technology.
From 2007 to 2012 he was EPSRC research fellow at Queen Mary University of London, UK. Also, he has extensive experience of working with such industrial giants as Nokia, Samsung Electronics and Bosch.
He is a holder of the Russian Federation President’s Prize in Science and Innovation for Young Scientists (2009), IET Achievement Medal (IET, UK, 2006), International Dennis Gabor Award (NOVOFER Foundation, Hungary, 2003)
Pavel Belov is co-author of more than 300 scientific articles in refereed journals and 13 book chapters.