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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 9 — Sep. 1, 2014
  • pp: 1912–1918

Maximum absorption by homogeneous magneto-dielectric sphere

Michael Forum Palvig, Olav Breinbjerg, and Morten Willatzen  »View Author Affiliations


JOSA A, Vol. 31, Issue 9, pp. 1912-1918 (2014)
http://dx.doi.org/10.1364/JOSAA.31.001912


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Abstract

In order to obtain a benchmark for electromagnetic energy harvesting, we investigate the maximum absorption efficiency by a magneto-dielectric homogeneous sphere illuminated by a plane wave, and we arrive at several novel results. For electrically small spheres we show that the optimal relative permeability and permeability of materials where ϵr, μr1 is (1+i3) independent of sphere size, while that of metamaterials is (2+iδ), where the imaginary part δ decreases strongly with decreasing sphere size. For larger spheres we show that while maximum absorption efficiency occurs at the resonances of the spherical modes, there exists a wide plateau of high absorption efficiency when material intrinsic impedance is constant; in the case of free-space intrinsic impedance and electrical radius κ=1, the absorption efficiency becomes 2.8. The investigation is analytic/numerical and based on the Lorenz–Mie theory combined with the optical theorem.

© 2014 Optical Society of America

OCIS Codes
(290.2200) Scattering : Extinction
(290.4020) Scattering : Mie theory
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Scattering

History
Original Manuscript: March 14, 2014
Revised Manuscript: July 17, 2014
Manuscript Accepted: July 17, 2014
Published: August 5, 2014

Citation
Michael Forum Palvig, Olav Breinbjerg, and Morten Willatzen, "Maximum absorption by homogeneous magneto-dielectric sphere," J. Opt. Soc. Am. A 31, 1912-1918 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-9-1912


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