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Extinction by a Homogeneous Spherical Particle in an Absorbing MediumWe use a recent computer implementation of the first principles theory of electromagnetic scattering to compute far-field extinction by a spherical particle embedded in an absorbing unbounded host. Our results show that the suppressing effect of increasing absorption inside the host medium on the ripple structure of the extinction efficiency factor as a function of the size parameter is similar to the well-known effect of increasing absorption inside a particle embedded in a nonabsorbing host. However, the accompanying effects on the interference structure of the extinction efficiency curves are diametrically opposite. As a result, sufficiently large absorption inside the host medium can cause negative particulate extinction. We offer a simple physical explanation of the phenomenon of negative extinction consistent with the interpretation of the interference structure as being the result of interference of the field transmitted by the particle and the diffracted field due to an incomplete wave front resulting from the blockage of the incident plane wave by the particle's geometrical projection.
Document ID
20180000958
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mishchenko, Michael I.
(NASA Goddard Inst. for Space Studies New York, NY, United States)
Videen, Gorden
(Army Research Lab. Adelphi, MD, United States)
Yang, Ping
(Texas A&M System Univ. College Station, TX, United States)
Date Acquired
February 5, 2018
Publication Date
November 22, 2017
Publication Information
Publication: Optics Letters
Publisher: Optical Society of America
Volume: 42
Issue: 23
ISSN: 0146-9592
e-ISSN: 1539-4794
Subject Category
Optics
Report/Patent Number
GSFC-E-DAA-TN51340
Distribution Limits
Public
Copyright
Other
Keywords
Scattering
particles; Scattering theory; Extinction; Resonance

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