Multiphoton excitation of surface plasmon-polaritons and scaling of nanoripple formation in large bandgap materials

Abstract

Abstract:We report studies of multiphoton mechanisms of plasmon excitation and their influence on the femtosecond-laser induced subwavelength ripple generation in large-bandgap dielectric and semiconducting transparent materials. An extended Drude-Sipe formalism is applied to quantitatively estimate the real part of the dielectric function which is dependent on the carrier density. The theory is able to predict the ripple periods for selected materials in good agreement with the experimental observations. Possible limitations at very small spatial periods are also discussed.

Pulsed laser ablation of Germanium under vacuum and hydrogen environments at various fluences

“…3d). The formation of ripples can be explained on the basis of many theories like generation of surface plasmon's [21,22], Kelvin-Helmholtz instability [23] and capillary waves [24]. During laser-matter interaction, the electric part of the laser radiation would excite oscillation in front of the surface and surface plasmon's are generated [21].…”

From random inhomogeneities to periodic nanostructures induced in bulk silica by ultrashort laser

“…The periodicity of these nanoplanes is independent of the collision frequency of excited fused silica ν e and periodic intensity patterns appear even for the case of nonexcited surface plasmons Re( ) > −n 2 [97,99,100], where is dielectric permittivity defined by the Drude formalism. This fact suggests that the organization of LFNGs here is due to interface roughness.…”

“…This interference causes periodic energy deposition [93][94][95]. In addition, an interference of the incident wave with the excited surface plasmon polaritons also leads to an enhancement of surface periodic structure formation under the conditions required for the surface plasmons [96][97][98][99][100]. Moreover, both scenarios were used to explain VNG formation [9,33,41].…”

Femtosecond laser induced phenomena in transparent solid materials: Fundamentals and applications

“…LIPSSs are also referred to ripples or gratings. Two typical groups of fs-LIPSSs termed as low-spatial-frequency LIPSSs (LSFLs) and high-spatial-frequency LIPSSs (HSFLs) with different spatial periods and orientations are identified, which depend on the irradiation conditions and materials parameters, such as incident laser fluence and refractive index [263,264,[267][268][269][270][271].…”