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Scattering of a Tightly Focused Beam by an Optically Trapped ParticleNear-forward scattering of an optically trapped 5 m radius polystyrene latex sphere by the trapping beam was examined both theoretically and experimentally. Since the trapping beam is tightly focused, the beam fields superpose and interfere with the scattered fields in the forward hemisphere. The observed light intensity consists of a series of concentric bright and dark fringes centered about the forward scattering direction. Both the number of fringes and their contrast depend on the position of the trapping beam focal waist with respect to the sphere. The fringes are caused by diffraction due to the truncation of the tail of the trapping beam as the beam is transmitted through the sphere.
Document ID
Document Type
Preprint (Draft being sent to journal)
Lock, James A.
(Cleveland State Univ. Cleveland, OH, United States)
Wrbanek, Susan Y.
(NASA Glenn Research Center Cleveland, OH, United States)
Weiland, Kenneth E.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2006
Subject Category
Funding Number(s)
WBS: WBS 581-02-08-03-08-02
Distribution Limits
Work of the US Gov. Public Use Permitted.
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