Abstract
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.
Highlights
C scitation.org/journal/adv field of sufficient strength) lead to substantial modifications of near band gap absorption, since the light field cannot be treated as a small perturbation, i.e., non-perturbative effect
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
In this paper we demonstrate ultrafast optical switching using low cost, fabricated organic OPV cells based on P3HT:PCBM films which is a mixture of random oriented organic semiconductors
Summary
C scitation.org/journal/adv field of sufficient strength) lead to substantial modifications of near band gap absorption, since the light field cannot be treated as a small perturbation, i.e., non-perturbative effect. Ultrafast laser-induced transparency is demonstrated using femtosecond (fs) pump-probe experiments in the organic P3HT:PCBM (donor:acceptor) blend structure.
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