School: Kharkiv National University of Radio Electronics, Ukraine
Advisor: Prof. Alexander I. Nosich
Project Topic: Diffraction radiation of electron beams from optical nanoresonators: antenna effects and beam diagnostics.
Dariia Yevtushenko will receive her M.Sc. degree in Photonics and Optoinformatics from the Kharkiv National University of Radio Electronics in February 2019. Additionally, she is an undergraduate research assistant at the Laboratory of Micro and Nano Optics under the supervision of Prof. Alexander I. Nosich. Her research interests include Computational Electromagnetics, Plasmonics, Photonics and Diffraction Radiation.
We plan to study the diffraction radiation that accompanies the motion of a modulated sheet of electrons near dielectric and noble-metal nanowire scatterers, in the optical wavelength range. If one can neglect the action of the field on the particles, then the electromagnetic field of such a two-dimensional beam takes form of surface wave propagating along the beam trajectory. This wave induces the polarization and surface currents on the local obstacles and hence a radiation occurs even if the beam does not touch the obstacle. In fact, the scatterer plays role of optical or microwave antenna, which makes the beam of particles visible. In particular, a metal nanowire behaves as an open resonator, thanks to which the diffraction radiation is enhanced near the localized surface plasmon resonance wavelength. Measuring the spatial pattern of the diffraction radiation and its intensity, one can judge about the energy and trajectory of the electrons. This study can be useful in the design of novel sensors of beam position and velocity. It is expected to lead to several conference papers and has potential to be published as a journal paper.