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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…
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…