title: Regimes of laser-induced periodic surface structure on germanium: radiation remnants and surface plasmons.
abstract: We present experimental evidence showing that the period of the rippled surface structure induced on germanium by 1.06-microm laser pulses undergoes a discontinuous shift above a certain threshold intensity. The measured shift, as a angle of incidence of the damaging beam, is quantitatively interpreted as a transition between a regime of inhomogeneous melting controlled by radiation-remnant field structures and a regime of ripple formation surface plasmons in an optically thick layer of liquid, metallic germanium formed at the surface.
authors.forename: J F
authors.initials: JF
authors.lastname: Young
authors.forename: J E
authors.initials: JE
authors.lastname: Sipe
authors.forename: H M
authors.initials: HM
authors.lastname: van Driel