3 papers
physics.optics2026
Orbital and spin current density backflow in unidirectional monochromatic electromagnetic fields in vacuum
Peeter Saari, Ioannis Besieris
In this study, energy backflow in the Poynting vector, as well as its orbital and spin current density components, has been examined for a 2-dimensional causal unidirectional vecto…
math-ph2025
Wave pulses with unusual asymptotical behavior at infinity
Peeter Saari, Ioannis Besieris
The behavior of wave signals in the far zone is not only of theoretical interest but also of paramount practical importance in communications and other fields of applications of op…
physics.optics2024
Study of energy backflow in unidirectional monochromatic and space-time waves
Peeter Saari, Ioannis Besieris
Backflow, or retropropagation, is a counterintuitive phenomenon whereby for a forward-propagating wave the energy locally propagates backward. In the context of backflow, physicall…