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Kanngiesser, Franz ORCID: 0000-0002-2972-514X and Eriksson, Patrick ORCID: 0000-0002-8475-0479 (2022). Cautious note on using the discrete dipole approximation for inhomogeneous, spherical scatterers with high optical contrast. Opt. Lett., 47 (16). S. 4203 - 4207. WASHINGTON: Optica Publishing Group. ISSN 1539-4794

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Abstract

The discrete dipole approximation (DDA) is capable of treating scatterers with arbitrary shape and composition. However, large values of the refractive index require additional considerations. DDA calculations are performed for small spheres with a stronger absorbing inclusion and compared to T-matrix results. A natural phenomenon with strong optical contrasts is the melting of ice hydrometeors at microwave frequencies, and hence corresponding refractive indices are chosen. The obtained extinction and absorption efficiencies are found to depend mainly on the dipole size, whereas the phase function closely follows the T-matrix results by choosing a smaller stopping criterion and changing the polarizability formulation. (C) 2022 Optica Publishing Group

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kanngiesser, Franz UNSPECIFIED orcid.org/0000-0002-2972-514X UNSPECIFIED Eriksson, Patrick UNSPECIFIED orcid.org/0000-0002-8475-0479 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-667522
DOI:	10.1364/OL.463561
Journal or Publication Title:	Opt. Lett.
Volume:	47
Number:	16
Page Range:	S. 4203 - 4207
Date:	2022
Publisher:	Optica Publishing Group
Place of Publication:	WASHINGTON
ISSN:	1539-4794
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MICROWAVE; PARTICLES Multiple languages Optics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66752