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Absorption length for photon propagation in highly dense colloidal dispersions

Summary: Absorption length for photon propagation in highly dense
colloidal dispersions
Rajeev Garg, Robert K. Prud'homme, and Ilhan A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Feng Liu and Robert R. Alfano
Department of Physics and Electrical Engineering, Institute for Ultrafast Spectroscopy and Lasers, New
York State, Center of Advanced Technology for Ultrafast Photonic Materials and Applications, The City
College and the Graduate Center of the City University of New York, New York, New York 10031
(Received 26 September 1997; accepted 8 April 1998)
The absorption length for photon propagation in highly concentrated colloidal dispersions
calculated from temporal intensity profiles of 100 femto-second pulses is much longer
than the absorption length obtained from the measurements of static light transmission in
the pure continuous phase fluid. The difference between these two values is explained on
the basis of small interparticle spacing at high particle concentration and hence shorter
paths traveled by photons through the absorbing medium relative to the total diffusive
path in the dispersion. The two values are in good agreement when the absorption length
is rescaled with the interparticle separation.
Light propagation in highly scattering and absorbing


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University


Collections: Materials Science