Experimental verification of the intrinsic ultrafast delayed nonlinearity of gold

Morten Bache, Oleg Lysenko, Nicolas Olivier, Anatoly V. Zayats, Andrei Lavrinenko

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review


    Surface plasmon polaritons (SPPs) in plasmonic metal waveguides can excite a third-order nonlinear response [1] much akin the well-known self-phase modulation (SPM) and two-photon absorption seen in light propagating in dielectric waveguides. In metals, the nonlinearity mainly arises as a self-acting effect: after absorption of the incident light the nonlinearity arises due to hot-electron contributions from changes of the intrinsic electronic lattice temperature. Using the so-called two-temperature model (TTM), the characteristic thermalization time of free-electrons in noble metals, such as gold, is described by an intrinsic delayed response function acting on a femtosecond-picosecond scale [1], explaining why the measured χ(3) values of gold are affected by the laser pulse duration. Here we show experimental data performed using picosecond [2] and femtosecond [3] laser pulses that for the first time allows to quantitatively connect the measured χ(3) values with the nonlinear coefficient of a nonlinear Schrödinger equation (NLSE) using the TTM to derive the nonlinearity.
    Original languageEnglish
    Title of host publication2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    Publication date2017
    ISBN (Electronic)978-1-5090-6736-7
    Publication statusPublished - 2017
    EventThe 2017 European Conference on Lasers and Electro-Optics - Munich, Germany
    Duration: 25 Jun 201729 Jun 2017


    ConferenceThe 2017 European Conference on Lasers and Electro-Optics
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