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Omnidirectional absorption in nanostructured metal surfaces

AuthorsTeperik, Tatiana V.; García de Abajo, Francisco Javier ; Abdelsalam, M.; Sugawara, Y.; Baumberg, J. J.
Issue Date2008
PublisherNature Publishing Group
CitationNature Photonics 2: 299-301 (2008)
AbstractLight absorbers available at present provide far from optimal black-body performance. The need for more efficient absorbers is particularly acute on the microscale, where they can play a significant role in preventing crosstalk between optical interconnects, and also as thermal light-emitting sources. Several efforts have been made in this context to achieve near-total but directionally dependent absorption using periodic grating structures. However, the ability to absorb light completely for any incident direction of light remains a challenge. Here we show that total omnidirectional absorption of light can be achieved in nanostructured metal surfaces that sustain localized optical excitations. The effect is realized over a full range of incident angles and can be tuned throughout the visible and near-infrared regimes by scaling the nanostructure dimensions. We suggest that surfaces displaying omnidirectional absorption will play a key role in devising efficient photovoltaic cells in which the absorbed light leads to electron-hole pair production. © 2008 Nature Publishing Group.
Identifiersdoi: 10.1038/nphoton.2008.76
issn: 1749-4885
Appears in Collections:(CFMAC-IO) Artículos
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