Physical optics

Alternative phase functions in the modelling of coherent backscattering

V. L. Kuz'min^a, Yu. A. Zhavoronkov^ab, S. V. Ul'yanov<sup>b

a</sup> Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
^b Saint Petersburg State University, 199034 St. Petersburg, Russia

Abstract: Modelling of the coherent backscattering effect based on the Bethe–Solpeter equation has been carried out when anisotropy is taken into account using two different phase functions. It is found that with increasing anisotropy of the single scattering indicatrix, calculations with the Rayleigh–Gans phase function lead to wider angular peaks of coherent backscattering than calculations with the Henya–Greenstein phase function. Monte Carlo simulations of coherent backscattering based on the Rayleigh–Hans phase function have been performed for the first time. On the basis of alternative phase functions, the effect of decreasing the spatial coherence length of the incident radiation on the shape of the angular peak of coherent backscattering is investigated. It is shown that with decreasing coherence length both models lead to broadening of the peak, which can be used in biomedical diagnostics.

Keywords: Coherent backscattering, Monte Carlo simulations, Bethe–Solpeter equation.

Received: 26.07.2023
Revised: 06.04.2024
Accepted: 06.04.2024

DOI: 10.61011/OS.2024.04.58221.5453-24

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