HOLLOW CORE WAVEGUIDES FOR RADIATION DELIVERY AND SENSING: MONTE CARLO, RAY TRACING COMPUTER SIMULATION

摘要

The use hollow core waveguides (HCW's) in biomedicine includes two different tasks: Power delivery in order to facilitate clinical procedures and measurement of beam parameters in order to sense the surrounding tissue and create a diagnosis.rnTo study the interaction between light and waveguide a computer simulation of ray propagation inside a HCW was developed. The simulation is based on the statistical method of Monte Carlo repeated trials and of ray tracing optics. The simulation accounts for both meridional and skew rays, rough fiber surface, Imperfect reflection, arbitrary fiber geometry and the insertion of absorbing molecular clusters inside the fiber lumen for sensing purposes.rnHere we test skew rays. At first the effect of skewness on the number of wall hits and the optical distance is investigated. Then different beam profiles are tested to fulfill different tasks: Sensing and power delivery. The role of skew rays in each scenario is discussed.