Toward the formation of crossed laser-induced periodic surface structures

The formation of a new type of laser-induced periodic surface structures using a femtosecond pulsed laser is studied on the basis of the Sipe-Drude theory solved with a FDTD scheme. Our numerical results indicate the possibility of coexisting structures parallel and perpendicular to the polarization of the incident light for low reduced collision frequency ($γ/ω\lesssim 1/4$, where $ω$ is the laser frequency). Moreover, these structures have a periodicity of $Λ\sim λ$ in both orientations. To explain this behavior, light-matter interaction around a single surface inhomogeneity is also studied and confirms the simultaneous presence of surface plasmon polaritons and radiation remnants in orthogonal orientations at low $γ/ω$ values.

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