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Plasmon–exciton systems with high quantum yield using deterministic aluminium nanostructures with rotational symmetries

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Abstract

The abundance and corrosion-resistant properties of aluminium, coupled with its compatibility to silicon processing make aluminium an excellent plasmonic material for light–matter interaction in the ultraviolet-visible spectrum. We investigate the interplay of the excitation and emission enhancements of quantum dots coupled with ultra-small aluminium nanoantennae with varying rotational symmetries, where emission enhancements of ∼8 and ∼6 times have been directly measured for gammadion and star-shaped structures. We observed spontaneous emission modification in the Al antenna with a C6 symmetry and deduce a Purcell factor in the range of 68.01 < FP < 118.25 at plasmonic hotspots, corresponding to a modified quantum yield of >89% in the single antenna and near-unity quantum yield at the plasmonic hotspots. This finding brings us a step closer towards the realization of circularly polarized nanoemitters.

Graphical abstract: Plasmon–exciton systems with high quantum yield using deterministic aluminium nanostructures with rotational symmetries

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Publication details

The article was received on 31 Jul 2019, accepted on 25 Sep 2019 and first published on 28 Sep 2019


Article type: Paper
DOI: 10.1039/C9NR06311K
Nanoscale, 2019, Advance Article

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    Plasmon–exciton systems with high quantum yield using deterministic aluminium nanostructures with rotational symmetries

    L. Y. M. Tobing, M. D. Birowosuto, K. E. Fong, Y. Gao, J. Tong, F. Suo, C. Dang, H. V. Demir and D. H. Zhang, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR06311K

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