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Interpretation of Extinction in Gaussian-Beam ScatteringThe extinction efficiency for the interaction of a plane wave with a large nonabsorbing spherical particle is approximately 2.0. When a Gaussian beam of half-width w(sub 0) is incident upon a spherical particle of radius a with w(sub 0)/a less than 1, the extinction efficiency attains unexpectedly high or low values, contrary to intuitive expectations. The reason for this is associated with the so-called compensating term in the scattered field, which cancels the field of the Gaussian beam behind the particle, thereby producing the particle's shadow. I introduce a decomposition of the total exterior field into incoming and outgoing portions that are free of compensating terms. It is then shown that a suitably defined interaction efficiency has the intuitively expected asymptotic values of 2.0 for w(sub 0)/a much greater than 1 and 1.0 for w(sub 0)/a much less than 1.
Document ID
19970022873
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lock, James A. (Cleveland State Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Publication Information
Publication: J. Opt. Soc. Am. A
Publisher: Optical Society of America
Volume: 12
Issue: 5
ISSN: 0740-3232
Subject Category
Optics
Report/Patent Number
NASA-CR-204823
NAS 1.26:204823
Accession Number
97N23292
Funding Number(s)
CONTRACT_GRANT: NCC3-204
Distribution Limits
Public
Copyright
Public Use Permitted.

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