TY  - EJOU
AU  - Pryamikov, Andrey 

TI  - Reverse Energy Flows in Two-Dimensional Photonic Crystals and Similarities with Vortex Formation and Analogous Flows in Hydrodynamics
T2  - Fluid Dynamics \& Materials Processing

PY  - 2026
VL  - 22
IS  - 3
SN  - 1555-2578

AB  - This paper examines the connection between photonic band-gap formation in two types of two-dimensional photonic crystals and the emergence of reverse electromagnetic energy flows generated by linearly polarized plane waves incident on a photonic-crystal slab. We show that these reverse energy flows, observed in both transmitted and reflected fields, originate from vortex structures in the Poynting vector. The resulting energy-flow patterns exhibit striking analogies to vortex formation in fluid motion past obstacles. The geometry and dynamics of the Poynting-vector vortices determine whether the incident electromagnetic energy is impeded, leading to the formation of photonic band gaps, or instead guided through the structure, enabling transmission.
KW  - 2D photonic crystal; photonic band gap; Poynting vector; vortex

DO  - 10.32604/fdmp.2026.071903