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Photophysical and Redox NIR‐Sensitivity Enhancement in Photorefractive Polymer Composites
Author(s) -
Mecher Erwin,
GallegoGómez Francisco,
Meerholz Klaus,
Tillmann Hartwig,
Hörhold HansHeinrich,
Hummelen Jan C.
Publication year - 2004
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200300943
Subject(s) - photorefractive effect , gating , polymer , redox , materials science , sensitivity (control systems) , doping , wavelength , optoelectronics , pulse (music) , photochemistry , optics , chemistry , composite material , biophysics , electronic engineering , detector , engineering , metallurgy , physics , biology
Through the gate: The photophysical effect of “gating” (preillumination at a shorter wavelength) dramatically enhances the near‐infrared sensitivity of photorefractive polymer composites with generation‐limited recording dynamics. Gating with a short, intense pulse yields better results than when using a longer pulse of reduced intensity. Redox doping (providing permanent charges) leads to an additional improvement of the sensitivity by a factor of two. See the picture for an illustration of the gating mechanism.