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Large-Scale Silicon Nanophotonic Metasurfaces with Polarization Independent Near-Perfect Absorption
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.ORCID iD: 0000-0003-1769-1082
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
Örebro University, School of Science and Technology. Department of Physics, Chalmers University of Technology, Göteborg, Sweden; School of Science and Technology, Örebro University, Örebro, Sweden .ORCID iD: 0000-0002-2110-3071
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
2017 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 5, 3054-3060 p.Article in journal (Refereed) Published
Abstract [en]

Optically thin perfect light absorbers could find many uses in science and technology. However, most physical realizations of perfect absorption for the optical range rely on plasmonic excitations in nanostructured metallic metasurfaces, for which the absorbed light energy is quickly lost as heat due to rapid plasmon decay. Here we show that a silicon metasurface excited in a total internal reflection configuration can absorb at least 97% of incident near-infrared light due to interferences between coherent electric and magnetic dipole scattering from the silicon nanopillars that build up the metasurface and the reflected wave from the supporting glass substrate. This "near-perfect" absorption phenomenon loads more than 50 times more light energy into the semiconductor than what would be the case for a uniform silicon sheet of equal surface density, irrespective of incident polarization. We envisage that the concept could be used for the development of novel light harvesting and optical sensor devices.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 17, no 5, 3054-3060 p.
Keyword [en]
Metasurfaces, colloidal lithography, high-index nanophotonics, perfect absorption
National Category
Nano Technology Chemical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-57349DOI: 10.1021/acs.nanolett.7b00416ISI: 000401307300046PubMedID: 28358487Scopus ID: 2-s2.0-85019171855OAI: oai:DiVA.org:oru-57349DiVA: diva2:1098664
Funder
Swedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-09-14Bibliographically approved

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