title: High-order harmonic generation employing field enhancement by metallic fractal rough surfaces.
abstract: We numerically investigate high-order harmonic generation (HHG) in noble gases in the vicinity of fractal structures of metallic rough surfaces described by the restricted solid-on-solid model. The calculated intensity enhancement factors in the range of 10³ enables HHG up to the 50-th order with low pump intensity down to tens of GW/cm². The increased interaction volume of "hot spots" in the case of grazing incidence of s-polarized pump pulses leads to an efficiency of harmonics in the plateau region of about 10⁻⁷.
authors: Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, Berlin D-12489, Germany.
authors: Kwang-Hyon
authors: KH
authors: Kim
authors: Anton
authors: A
authors: Husakou
authors: Joachim
authors: J
authors: Herrmann
mesh_terms: D000465:Algorithms; D003102:Colloids; D003198:Computer Simulation; D004867:Equipment Design; D005583:Fourier Analysis; D017709:Fractals; D015994:Incidence; D008670:Metals / Q000737:chemistry*; D015233:Models, Statistical; D049329:Nanostructures; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics / Q000379:methods*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003102:Colloids; D008670:Metals