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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.
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Mecher et al. (2004) studied this question.
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