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Monte Carlo for Very Thin Layered Media

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.120
pages 37-40

Reginald Eze
Polytechnic University, Department of Mechanical, Aerospace and Manufacturing Engineering, 6 Metro Tech Center, Brooklyn, NY 11201 USA

Sunil Kumar
Department of Mechanical, Aerospace and Manufacturing Engineering, Polytechnic University, 6 Metrotech Center, Brooklyn, NY 11201, USA

Nabil Elkouh
Erigo Technologies LLC, Enfield, NH 03748-0899, U.S.A

Paul Sorenson
Creare Inc., P.O. Box 71 Hanover, NH03755 USA

Roger Hill
Creare Inc., P.O. Box 71 Hanover, NH03755 USA


Many modern applications of lasers involve modeling of radiation energy transport through very thin layers. The interactions of continuous wave and pulsed lasers with skin in dermatological use related to surgery and cosmetic procedures are examples of such. Highly scattering thin layers in skin are best modeled by Monte Carlo method since their interfaces are not perfectly planar and the thicknesses are non-uniform. Due to scattering, interference and other thin film wave effects are not important. Additionally, the common diffusion approximation utilized extensively in modeling bio-medical laser transport is invalid because of the proximity of interfaces where the diffusion approximation is known to be inaccurate.
Traditional Monte Carlo models may, however, inaccurately capture the effect of thin layers. As an example, the very thin epidermis with its highly absorbing melanin is known to influence the laser penetration significantly. If the Monte Carlo model is implemented without special features then the results of the simulation would show no effect of the outer thin layer since the path length of most photons would be significantly larger than the layer thickness and the resulting predicted photon travel would simply not notice the presence of the layer.
In this paper we present the results of using Monte Carlo to accurately model transport of radiation through very thin layers using both the traditional Monte Carlo and that with the new features incorporated. The results have profound implications in the diagnostic and therapeutic applications of laser in biomedicine and surgery.

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