Non-linear dynamics of absorption and photo-bleaching of dyes

Details Non-linear dynamics of absorption and photo-bleaching of dyes Non-linear dynamics of absorption and photo-bleaching of dyes

2008-01-10

arxiv.org/abs/0801.1641v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1063/1.2937455

The celebrated Lambert-Beer law of light absorption in photochromic media is only valid at low intensities of incident light and low concentration of chromophore. Here we address the generic problem of photo-absorption dynamics, experimentally studying the case of azobenzene isomerization. We show that the non-linear regime is very common and easy to achieve in many practical situations, especially in thick samples where the light depletes the chromophore in the first layers and can propagate through the medium with a sub-exponential law. Importantly, the crossover into the non-linear absorption regime only weakly depends on the dye concentration and solution viscosity. We experimentally quantify the characteristics of this peculiar optical response and determine the key transition rate constants.

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