MASS TRANSFER IN OPTICAL NANOCOMPOSITES INDUCED BY PULSED LASER
IRRADIATION

Yu. Kaganovskii, M. Rosenbluh
The Jack and Pearl Resnick Institute of Advanced Technology,
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel;
A. A. Lipovskii
St. Petersburg State Technical University, Russia.

We study interaction of pulsed laser irradiation with composite
optical materials consisting of dielectric matrix (like to glass)
transparent for light with embedded metal or semiconductor
nanoclusters of 5 - 20 nm in radius absorbing light energy. These
materials are sensitive to pulsed irradiation, which stimulates
growth, motion and coalescence of nanoclusters. Due to light induced
mass transfer optical recording becomes possible in these materials.
The kinetics of cluster motion during optical recording is studied in
experiments with coherent irradiation of optical composites by two
intersecting beams, which create interference field. Nanoclusters move
to each other and towards the irradiated surface where they form
periodically located lines of sub-micron width. We present the
theoretical analysis of temperature distributions and their evolution
around nanoclusters of various sizes under pulsed irradiation of
nanosecond and femtosecond pulse duration. We demonstrate that
nanoclusters are heated up to temperatures high enough to form a
liquid shell at the cluster-matrix interface. A thermo-diffusion
mechanism of cluster motion is proposed. The temperature gradients
appear due to overlapping of temperature fields from adjacent clusters
as well as due to reflection of the heat flux from irradiated surface.
The calculated kinetics of cluster motion is in agreement with the
experimental observations.

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