2026-10-13T20:01:49Z https://www.scidb.cn/oai

10.57760/sciencedb.35741 2026-05-06T11:22:27Z

2026-05-06 Vortex-harmonics-ENZ-w+3w doi:10.57760/sciencedb.35741 en Vortex harmonic radiation in an indium tin oxide thin film near the epsilon-near-zero (ENZ) region, driven by an ultrashort ω0+3ω0 two-color field, is theoretically investigated via numerical solution of the full-wave Maxwell equations with a nonlinear Kerr response. By adjusting the topological charge of the fundamental field or the amplitude ratio between the ω0 and 3ω0 components, different photon combination pathways contributing to each order harmonic are distinguished. These pathways are manifested in characteristic spatiotemporal field distributions, ring-shaped intensity profiles with different radii, and spiral phase structures carrying different topological charges. The results demonstrate that the orbital angular momentum of harmonic radiation provides an effective indicator for identifying photon combination pathways. Vortex ; ENZ; Harmonics Liu Chengpu PUBLIC https://creativecommons.org/licenses/by-sa/4.0/ dataset Science Data Bank