Correlated, Dual-Beam Optical Gating in Coupled Organic–Inorganic Nanostructures
Kai M. Wurst (Eberhard Karls Universität Tübingen)
Markus Bender (University of Heidelberg)
Jannika Lauth (University of Oldenburg)
Sonam Maiti (Eberhard Karls Universität Tübingen)
Thomas Chassé (Eberhard Karls Universität Tübingen)
Alfred Meixner (Eberhard Karls Universität Tübingen)
L.D.A. Siebbeles (TU Delft - ChemE/Opto-electronic Materials, TU Delft - ChemE/Chemical Engineering)
Uwe H.F. Bunz (University of Heidelberg)
Kai Braun (Eberhard Karls Universität Tübingen)
M. Scheele (Eberhard Karls Universität Tübingen)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
An optical switch with two distinct resonances is formed by combining PbS nanocrystals and the conductive polymer poly[sodium 2-(2-ethynyl-4-methoxyphenoxy)acetate] (PAE) into a hybrid thin film. Infrared excitation of the nanocrystals invokes charge transfer and consecutive polaron formation in the PAE, which activates the switch for excited-state absorption at visible frequencies. The optical modulation of the photocurrent response of the switch exhibits highly wavelength-selective ON/OFF ratios. Transient absorption spectroscopy shows that the polaron formation is correlated with the excited state of the nanocrystals, opening up new perspectives for photonic data processing. Such correlated activated absorption can be exploited to enhance the sensitivity for one optical signal by a second light source of different frequency as part of an optical amplifier or a device with AND logic.