Share Email Print
cover

Proceedings Paper

Monte Carlo simulation for coherent backscattering with diverging illumination (Conference Presentation)
Author(s): Wenli Wu; Andrew J. Radosevich; Adam Eshein; The-Quyen Nguyen; Vadim Backman

Paper Abstract

Diverging beam illumination is widely used in many optical techniques especially in fiber optic applications and coherence phenomenon is one of the most important properties to consider for these applications. Until now, people have used Monte Carlo simulations to study the backscattering coherence phenomenon in collimated beam illumination only. We are the first one to study the coherence phenomenon under the exact diverging beam geometry by taking into account the impossibility of the existence for the exact time-reversed path pairs of photons, which is the main contribution to the backscattering coherence pattern in collimated beam. In this work, we present a Monte Carlo simulation that considers the influence of the illumination numerical aperture. The simulation tracks the electric field for the unique paths of forward path and reverse path in time-reversed pairs of photons as well as the same path shared by them. With this approach, we can model the coherence pattern formed between the pairs by considering their phase difference at the collection plane directly. To validate this model, we use the Low-coherence Enhanced Backscattering Spectroscopy, one of the instruments looking at the coherence pattern using diverging beam illumination, as the benchmark to compare with. In the end, we show how this diverging configuration would significantly change the coherent pattern under coherent light source and incoherent light source. This Monte Carlo model we developed can be used to study the backscattering phenomenon in both coherence and non-coherence situation with both collimated beam and diverging beam setups.

Paper Details

Date Published: 26 April 2016
PDF: 1 pages
Proc. SPIE 9702, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVI, 97020N (26 April 2016); doi: 10.1117/12.2211923
Show Author Affiliations
Wenli Wu, Northwestern Univ. (United States)
Andrew J. Radosevich, Northwestern Univ. (United States)
Adam Eshein, Northwestern Univ. (United States)
The-Quyen Nguyen, Northwestern Univ. (United States)
Vadim Backman, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 9702:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVI
Israel Gannot, Editor(s)

© SPIE. Terms of Use
Back to Top