Ames Laboratory; Physics and Astronomy; Microelectronics Research Center (MRC)
Physics and Astronomy, Ames Laboratory, Microelectronics Research Center (MRC)
Ultrafast laser-induced transparency is demonstrated using femtosecond (fs) pump-probe experiments in the organic P3HT:PCBM (donor:acceptor) blend structure. For above band gap pumping, ultrafast transient signals strongly depend on the probe photon energy. Most intriguingly, for below band gap pumping at 0.95 eV, or 1.3 µm at a telecom wavelength, a huge transmission increase up to 30% only during the laser pulse ∼100 fs is observed as a pump-driven, quasi-instantaneous suppression of absorption for the high photon-energy energy probe beam. We attribute the observed laser-driven transparency to dynamic Franz-Keldysh effect, at least one order of magnitude stronger compared to the multiphoton nonlinearities. Our results may be used for development of low-cost, beyond 100 Gbit/s optical switching devices.
DOE Contract Number(s)
Department of Energy Subject Categories
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Iowa State University Digital Repository, Ames IA (United States)