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HL: Fachverband Halbleiterphysik

HL 89: Transport II

HL 89.1: Talk

Thursday, March 14, 2013, 16:45–17:00, H16

Non-equilibrium Polaritonics - Non-linear Effects and Optical Switching — •Regine Frank — Institut für Theoretische Physik, Universität Tübingen

A microscopic electronic non-equilibrium effect, highly nonlinear polaritonics, is proposed to mediate an ultrafast all-optical switching. The electronic band structure within the switching material shall be modified by external laser light, namely the Franz-Keldysh effect, and the modified electronic density of states within the Au grains are coupled to a single mode photonic waveguide. Using this microscopic polaritonic coupling without ever including any macroscopic influences due to the geometric arrangement a strong transmission reduction originating from the established quantum interference is derived. The lifetime of the coupled states is heavily dependent on the Fano resonance type binding and the amplitude of the applied electric field. Besides the Fano signatures the microscopic coupling photon-electron-photon leads to a modified gaped electronic density of states within the switching material. On site interaction as well as finite temperature effects are considerd.