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Optical theorems and physical bounds on absorption in lossy media
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-3928-6064
Lund University.ORCID iD: 0000-0003-4362-5716
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-7018-6248
2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 23, p. 34323-34342, article id 377068Article in journal (Refereed) Published
Abstract [en]

Two different versions of an optical theorem for a scattering body embedded inside a lossy background medium are derived in this paper. The corresponding fundamental upper bounds on absorption are then obtained in closed form by elementary optimization techniques. The first version is formulated in terms of polarization currents (or equivalent currents) inside the scatterer and generalizes previous results given for a lossless medium. The corresponding bound is referred to here as a variational bound and is valid for an arbitrary geometry with a given material property. The second version is formulated in terms of the T-matrix parameters of an arbitrary linear scatterer circumscribed by a spherical volume and gives a new fundamental upper bound on the total absorption of an inclusion with an arbitrary material property (including general bianisotropic materials). The two bounds are fundamentally different as they are based on different assumptions regarding the structure and the material property. Numerical examples including homogeneous and layered (core-shell) spheres are given to demonstrate that the two bounds provide complimentary information in a given scattering problem.

Place, publisher, year, edition, pages
2019. Vol. 27, no 23, p. 34323-34342, article id 377068
Keywords [en]
Material properties; Mie theory; Photon counting; Radiative transfer; Refractive index; Scattering
National Category
Other Physics Topics
Research subject
Physics, Waves and Signals
Identifiers
URN: urn:nbn:se:lnu:diva-89962DOI: 10.1364/OE.27.034323OAI: oai:DiVA.org:lnu-89962DiVA, id: diva2:1368831
Funder
Swedish Foundation for Strategic Research , AM13-0011Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08

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Publisher's full texthttps://doi.org/10.1364/OE.27.034323

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Ivanenko, YevhenGustafsson, MatsNordebo, Sven
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