Regensburg 2010 – wissenschaftliches Programm
DS 27.3: Vortrag
Mittwoch, 24. März 2010, 11:00–11:15, H32
plasmon-enhanced high-order harmonic generation in the vicinity of metal nanostructures — •song-jin im, anton husakou, and joachim herrmann — Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, D-12489 Berlin, Germany
Generation of high harmonics in noble gases is one of key topics of nonlinear optics, which is of a critical importance in many disciplines, for example in attosecond physics. Recently, plasmon-enhanced high-order harmonic generation became possible in the vicinity of bow-tie shaped nanostructures by pulses directly from an oscillator with MHz repetition rate. In this contribution, we simulate high-order harmonic generation by sub-TW/cm2 pulses using large plasmon field enhancement near metallic nanostructures such as bowtie-shaped antennas or nanocones. Our simulations using a commercial software JCMwave predict intensity enhancement of 3 orders of magnitude near the surface of silver nanocones. The generation of the high harmonics was modeled using a modified Lewenstein approach taking into account the inhomogeneity of the field and the electron absorption by the metal. Our results are consistent with experimental observations for bowtie elements. Considering the generation of high harmonics in argon in the vicinity of silver nanocones, we show that harmonics numbers up to 50, corresponding to 15 nm wavelength, can be achieved using relatively low input intensity of 300 GW/cm2, characteristic for nJ laser pulses directly from a laser oscillator with MHz repetition rate.