title: Femtosecond laser-induced periodic surface structures on silicon upon polarization controlled two-color double-pulse irradiation.
abstract: Two-color double-fs-pulse experiments were performed on silicon wafers to study the temporally distributed energy deposition in the formation of laser-induced periodic surface structures (LIPSS). A Mach-Zehnder interferometer generated parallel or cross-polarized double-pulse sequences at 400 and 800 nm wavelength, with inter-pulse delays up to a few picoseconds between the sub-ablation 50-fs-pulses. Multiple two-color double-pulse sequences were collinearly focused by a spherical mirror to the sample. The resulting LIPSS characteristics (periods, areas) were analyzed by scanning electron microscopy. A wavelength-dependent plasmonic mechanism is proposed to explain the delay-dependence of the LIPSS. These two-color experiments extend previous single-color studies and prove the importance of the ultrafast energy deposition for LIPSS formation.
authors.forename: Sandra
authors.initials: S
authors.lastname: Höhm
authors.forename: Marcel
authors.initials: M
authors.lastname: Herzlieb
authors.forename: Arkadi
authors.initials: A
authors.lastname: Rosenfeld
authors.forename: Jörg
authors.initials: J
authors.lastname: Krüger
authors.forename: Jörn
authors.initials: J
authors.lastname: Bonse