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Correlated, Dual‐Beam Optical Gating in Coupled Organic–Inorganic Nanostructures
Author(s) -
Wurst Kai M.,
Bender Markus,
Lauth Jannika,
Maiti Sonam,
Chassé Thomas,
Meixner Alfred,
Siebbeles Laurens D. A.,
Bunz Uwe H. F.,
Braun Kai,
Scheele Marcus
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201803452
Subject(s) - polaron , materials science , optoelectronics , photocurrent , excited state , absorption (acoustics) , optical switch , absorption spectroscopy , nanocrystal , photoexcitation , optics , nanotechnology , atomic physics , physics , quantum mechanics , composite material , electron
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.