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O: Fachverband Oberflächenphysik

O 41: Plasmonics and Nanooptics IV

O 41.5: Vortrag

Mittwoch, 16. März 2011, 12:15–12:30, WIL A317

Theory of ultrashort plasmon pulse generation by mode-locked surface plasmon polariton lasers — •Kwang-Hyon Kim, Anton Husakou, and Joachim Herrmann — Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, 12489 Berlin

Amplification of surface plasmon polaritons (SPP) by embedding a dielectric with a gain medium is of great importance for a variety of applications including surface spectroscopy, imaging and information processing. By adding a feedback and a fast modulator, mode-locked lasing of SPPs becomes possible. In this contribution, we extend a semiclassical theory of surface plasmon polariton lasers to the case of mode-locked SPP lasers. In the considered scheme feedback is provided by a Bragg reflector of SPPs, and the SPP laser is composed of a metal film deposited on a polymer host as well as a saturable absorber layer and a gain layer. We investigate mode-locking characteristics, such as pulse duration and peak intensity, in dependence on the layer thickness of the metal film and the absorber layer, the pump intensity, and densities of gain and absorber molecules. We consider the dyes R6G as gain and DQOCI as saturable absorber and predict the possibility of SPP pulse generation with maximum peak intensity of more than 500 GW/cm² and shortest pulse duration of 280 fs.