Monte Carlo for Very Thin Layered Media

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.