Optical theorem for two-dimensional (2D) scalar monochromatic acoustical beams in cylindrical coordinates

Ultrasonics
F Mitri

Abstract

The optical theorem for plane waves is recognized as one of the fundamental theorems in optical, acoustical and quantum wave scattering theory as it relates the extinction cross-section to the forward scattering complex amplitude function. Here, the optical theorem is extended and generalized in a cylindrical coordinates system for the case of 2D beams of arbitrary character as opposed to plane waves of infinite extent. The case of scalar monochromatic acoustical wavefronts is considered, and generalized analytical expressions for the extinction, absorption and scattering cross-sections are derived and extended in the framework of the scalar resonance scattering theory. The analysis reveals the presence of an interference scattering cross-section term describing the interaction between the diffracted Franz waves with the resonance elastic waves. The extended optical theorem in cylindrical coordinates is applicable to any object of arbitrary geometry in 2D located arbitrarily in the beam's path. Related investigations in optics, acoustics and quantum mechanics will benefit from this analysis in the context of wave scattering theory and other phenomena closely connected to it, such as the multiple scattering by a cloud of particl...Continue Reading

References

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Citations

Nov 13, 2015·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Edwin A Marengo
Jul 3, 2016·The Journal of the Acoustical Society of America·Philip L Marston, Likun Zhang
Jan 1, 2021·The Journal of the Acoustical Society of America·Fabien Montiel, Hyuck Chung
Mar 16, 2021·Optics Letters·Alexey A Dmitriev, Mikhail V Rybin

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