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Proceedings Paper

High performance absorber structure using subwavelength multi-branch dimers
Author(s): Kebo He; Guangyao Su; Chuanhong Liu; Fangwang Gou; Zhaoyu Zhang
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Paper Abstract

As the desire growing of the thin film absorption structure for various sub-wavelength applications such as photo detector, thin-film thermal emitters, thermo photovoltaic cells, and multi-color filters, we proposed a type of subwavelength multi-branch dimers which exhibit several tunable dipole-dipole-like plasmonic resonances and integrated it into metal-insulator-metal structure as the top layer. The structures are studied through numerical calculation by finite element method. When normal incident is considered, the novel structure shows three absorption peaks in the considered wavelength range. One peak has near-perfect absorption and the other two also show excellent absorption.. When different angle oblique incident is considered, the absorption only has slight change, which is useful to an ultrathin absorber structure. In addition, we find that the thickness of the dielectric layer can tune the absorption rates for each absorption peak. In general, the multi-branch dimers can easily tune its absorption rates and spectrum via the change of their geometric parameters such as branch lengths, branch angles, and dielectric layer thickness.

Paper Details

Date Published: 20 November 2012
PDF: 6 pages
Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85641H (20 November 2012); doi: 10.1117/12.2007406
Show Author Affiliations
Kebo He, Peking Univ. Shenzhen Graduate School (China)
Guangyao Su, Peking Univ. Shenzhen Graduate School (China)
Chuanhong Liu, Peking Univ. Shenzhen Graduate School (China)
Fangwang Gou, Peking Univ. Shenzhen Graduate School (China)
Zhaoyu Zhang, Peking Univ. Shenzhen Graduate School (China)

Published in SPIE Proceedings Vol. 8564:
Nanophotonics and Micro/Nano Optics
Zhiping Zhou; Kazumi Wada, Editor(s)

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