Local cross-sections and energy efficiencies in the multiple electromagnetic/optical scattering by two perfect electrically-conducting cylindrical particles

• Published in: Journal of modern optics Vol. 66; no. 12; pp. 1347 - 1357
• Main Author: Mitri, F. G.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 12-07-2019; Taylor & Francis Ltd
• Subjects: Absorptivity; Addition theorem; Circular cylinders; Cylindrical coordinates; Electromagnetic optics; Energy; Extinction; Mathematical analysis; multiple scattering; Multipoles; optical tweezers/optical manipulation; Scattering; Scattering cross sections; scattering theory
• ISSN: 0950-0340; 1362-3044
• DOI: 10.1080/09500340.2019.1617445

Exact mathematical expressions for the intrinsic electromagnetic (EM) cross-sections (i.e. extinction, scattering and absorption) for a pair of perfectly conducting circular cylinders in a homogeneous non-absorptive medium are derived. The multipole expansion method in cylindrical coordinates and the translational addition theorem, applicable to any range of frequencies or particle sizes are used. An effective EM field, incident on the probed cylinder is defined first, which includes the initial and re-scattered field from the second cylinder. It is used jointly with the scattered field to derive the mathematical expressions for the intrinsic/local cross-sections. Numerical computations for the intrinsic extinction (or scattering) energy efficiencies per unit-length for a pair of conducting circular cylinders with different radii in a homogeneous medium are considered. The results computed a priori can be useful in the full characterization of a multiple scattering system of many particles, in conjunction with experimental data for the extrinsic cross-sections.