Letter. Omnidirectional absorption in nanostructured metal surfaces
Teperik, T.V., García de Abajo, F.J., Borisov, A.G., Abdelsalam, M., Bartlett, P.N., Sugawara, Y. and Baumberg, J.J. (2008) Letter. Omnidirectional absorption in nanostructured metal surfaces. Nature Photonics, 2, (5), 299-301. (doi:10.1038/nphoton.2008.76).
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Light 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.
|Keywords:||transmission, coatings, light-absorption,photonic crystals, gratings, silver, plasmons, films|
|Subjects:||Q Science > QC Physics
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
Faculty of Natural and Environmental Sciences > Chemistry > Electrochemistry
|Date Deposited:||15 Apr 2010 14:50|
|Last Modified:||28 Mar 2014 15:17|
NanoPhotonics Portfolio Partnership
Funded by: EPSRC (EP/C511786/1)
October 2004 to December 2009
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