국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Direct Simulation of Multiple Scattering by Discrete Random Media Illuminated by Gaussian Beams
저자	Mackowski, Daniel W.;; Mishchenko, Michael I.
Keyword	ELECTROMAGNETIC SCATTERING;; FAR FIELDS;; FORWARD SCATTERING;; ILLUMINATING;; MAGNETIC FIELDS;; MATRICES (MATHEMATICS); OBSERVATION;; PACKING DENSITY;; SIMULATION;; TARGETS
URL	http://dx.doi.org/10.1103/PhysRevA.83.013804
보고서번호	GSFC.JA.5141.2011
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The conventional orientation-averaging procedure developed in the framework of the superposition T-matrix approach is generalized to include the case of illumination by a Gaussian beam (GB). The resulting computer code is parallelized and used to perform extensive numerically exact calculations of electromagnetic scattering by volumes of discrete random medium consisting of monodisperse spherical particles. The size parameters of the scattering volumes are 40, 50, and 60, while their packing density is fixed at 5%. We demonstrate that all scattering patterns observed in the far-field zone of a random multisphere target and their evolution with decreasing width of the incident GB can be interpreted in terms of idealized theoretical concepts such as forward-scattering interference, coherent backscattering (CB), and diffuse multiple scattering. It is shown that the increasing violation of electromagnetic reciprocity with decreasing GB width suppresses and eventually eradicates all observable manifestations of CB. This result supplements the previous demonstration of the effects of broken reciprocity in the case of magneto-optically active particles subjected to an external magnetic field.