Journal
ACS PHOTONICS
Volume 2, Issue 9, Pages 1298-1305Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00233
Keywords
silicon nanocrystals; plasmon; nanorod; colloid
Categories
Funding
- KAKENHI [23310077, 24651143]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DOE DE-SC0010679]
- U.S. Army Research Laboratory through the Collaborative Research Alliance (CRA) for Multi Scale Multidisciplinary Modeling of Electronic Materials (MSME)
- Grants-in-Aid for Scientific Research [14J03120] Funding Source: KAKEN
- U.S. Department of Energy (DOE) [DE-SC0010679] Funding Source: U.S. Department of Energy (DOE)
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We develop colloidal nanocomposites consisting of coupled light-emitting Si nanocrystals (NCs) and Au nanorods and systematically investigate their structural and photoluminescence (PL) properties, which demonstrate significant enhancement of spontaneous emission rate with suppressed nonradiative quenching. In addition, through a comparison of the polarization dependence of PL and scattering intensities of single nanocomposites, we successfully demonstrate that the emission from Si NCs coupled to Au nanorods is highly polarized along the major axis of nanorods. The experimental results in combination with rigorous simulations of dipolar emission in the vicinity of Au nanorods enable us to demonstrate a 3 times enhancement of the quantum efficiency at the peak of the NC emission. The Si-based active plasmonic-coupled nanocomposites developed in this work provide novel opportunities for biocompatible platforms that leverage nanoscale fluorescent probes for biosensing and bioimaging device applications.
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