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Correlated,Dual‐Beam Optical Gating in Coupled Organic–Inorganic Nanostructures |
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| Authors: | Kai M. Wurst Dr. Markus Bender Dr. Jannika Lauth Sonam Maiti Prof. Thomas Chassé Prof. Alfred Meixner Prof. Laurens D. A. Siebbeles Prof. Uwe H. F. Bunz Dr. Kai Braun Dr. Marcus Scheele |
| Affiliation: | 1. Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany;2. Institute of Organic Chemistry and Centre for Advanced Materials, Ruprecht-Karls-Universit?t Heidelberg, Heidelberg, Germany;3. Institute of Chemistry, Physical Chemistry, Carl von Ossietzky University Oldenburg, Oldenburg, Germany;4. Chemical Engineering, Delft University of Technology, HZ, Delft, The Netherlands |
| 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. |
| Keywords: | conductive polymers coupled organic– inorganic nanostructures photoswitches polarons |