Abstract:
We show that not only holographic relaxation, but also luminescence recovery studies of diffusion based on formation of photoinduced optical inhomogeneity and subsequent monitoring its relaxation reveal changes in the diffusion coefficients caused by exposure. This makes it possible to study photoinduced aggregation, destruction, and release of particles. Holographic relaxometry and modified fluorescence recovery after photobleaching techniques are outlined. Experimental examples of the luminescence recovery technique applied to colloid solutions of quantum dots are provided that cannot be described by simple Gaussian profile model. Possible variants of relaxation curves and spatial luminescence profiles reflecting photoinduced changes in diffusion mobility are simulated. Comparative study of diffusion in a model system using the two techniques is fulfilled.
Keywords:photoinduced grating relaxation, fluorescence recovery after photobleaching, photoinduced change in diffusion coefficient, confocal microscopy, supplementary gratings, camphoroquinone, quantum dots.
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