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Energies 2010, 3(7), 1335-1343; doi:10.3390/en3071335

Metamaterial Electromagnetic Superabsorber with Arbitrary Geometries

1,* , 1
1 School of Information Science and Engineering, Yunnan University, Kunming 650091, China 2 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
* Author to whom correspondence should be addressed.
Received: 25 May 2010 / Revised: 23 June 2010 / Accepted: 28 June 2010 / Published: 29 June 2010
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The electromagnetic superabsorber that has larger absorption cross section than its real size may be a novel photothermal device with improved solar energy conversion rates. Based on a transformation optical approach, the material parameters for a two-dimensional (2D) metamaterial-assisted electromagnetic superabsorber with arbitrary geometries are derived and validated by numerical simulation. We find that for the given geometry size, the absorption cross section of the superabsorber using nonlinear transformation is larger than that using linear transformation. These transformations can also be specialized to the designing the N-sided regular polygonal superabsorber just by changing the contour equation. All theoretical and numerical results validate the material parameters for the 2D electromagnetic superabsorber we have developed.
Keywords: superabsorber; metamaterials; coordinate transformation superabsorber; metamaterials; coordinate transformation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yang, J.; Huang, M.; Yang, C.; Peng, J.; Zong, R. Metamaterial Electromagnetic Superabsorber with Arbitrary Geometries. Energies 2010, 3, 1335-1343.

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