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Issue 2, 2020
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Plasmonic nanosponges filled with silicon for enhanced white light emission

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Abstract

Plasmonic nanosponges are a powerful platform for various nanophotonic applications owing to extremely high local field enhancement in metallic nanopores. The filling of the nanopores with high-refractive index semiconductors (e.g. Si, Ge, GaP, etc.) opens up opportunities for the enhancement of nonlinear effects in these materials. However, this task remains challenging due to the lack of knowledge on the integration process of metal and high-index semiconductor components in such nanoobjects. Here, we investigate metal-dielectric nanoparticles fabricated from bilayer Si/Au films by the laser printing technique via a combination of theoretical and experimental methods. We reveal that these hybrid nanoparticles represent the Au sponge-like nanostructure filled with Si nanocrystallites. We also demonstrate that the Au net provides strong near-field enhancement in the Si grains increasing the white light photoluminescence in the hybrid nanostructures compared to uniform Si nanoparticles. These results pave the way for engineering the internal structure of the sponge-like hybrid nanoparticles possessing white light luminescence and control of their optical properties on demand.

Graphical abstract: Plasmonic nanosponges filled with silicon for enhanced white light emission

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Supplementary files

Article information


Submitted
19 Oct 2019
Accepted
02 Dec 2019
First published
04 Dec 2019

Nanoscale, 2020,12, 1013-1021
Article type
Paper

Plasmonic nanosponges filled with silicon for enhanced white light emission

A. O. Larin, A. Nominé, E. I. Ageev, J. Ghanbaja, L. N. Kolotova, S. V. Starikov, S. Bruyère, T. Belmonte, S. V. Makarov and D. A. Zuev, Nanoscale, 2020, 12, 1013
DOI: 10.1039/C9NR08952G

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