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Published August 1, 1999 | Published
Journal Article Open

Absorption distribution of an optical beam focused into a turbid medium


The focusing of light into a turbid medium was studied with Monte Carlo simulations. Focusing was found to have a significant effect on the absorption distribution in turbid media when the depth of the focal point (the distance between the focal point and the surface of the turbid media) was less than or comparable with the transport mean free path. Focusing could significantly increase the peak absorption and narrow the absorption distribution. As the depth of the focal point increased, the peak absorption decreased, and the depth of peak absorption increased initially but quickly reached a plateau that was less than the transport mean free path. A refractive-index-mismatched boundary between the ambient medium and the turbid medium deteriorated the focusing effect, increased the absorption near the boundary, lowered the peak absorption, and broadened the absorption distribution.

Additional Information

© 1999 Optical Society of America. Received 25 February 1999; revised manuscript received 28 April 1999. This project was sponsored in part by the National Institutes of Health grants R29 CA68562 and R01 CA71980 and the National Science Foundation grant BES-9734491.

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