Phase-resolved optical characterization of nanoscale spin waves
preprintposted on 2023-03-11, 17:01 authored by Ondřej Wojewoda, Martin Hrtoň, Meena Dhankhar, Jakub Krčma, Kristýna Davídková, Jan Klíma, Jakub Holobrádek, Filip Ligmajer, Tomáš Šikola, Michal Urbánek
We study theoretically and experimentally the process of Brillouin light scattering on an array of silicon disks on a thin Permalloy layer. We show that phase-resolved Brillouin light scattering microscopy performed on an array of weakly interacting dielectric nanoresonators can detect nanoscale waves and measure their dispersion. In our experiment, we were able to map the evolution of the phase of the spin wave with a wavelength of 209 nm with a precision of 6 nm. These results demonstrate the feasibility of all-optical phase-resolved characterization of nanoscale spin waves.