Please use this identifier to cite or link to this item:
Title: Huge enhancement in two-photon photoluminescence of au nanoparticle clusters revealed by single-particle spectroscopy
Authors: Guan, Z.
Gao, N.
Jiang, X.-F.
Yuan, P.
Han, F.
Xu, Q.-H. 
Issue Date: 15-May-2013
Source: Guan, Z., Gao, N., Jiang, X.-F., Yuan, P., Han, F., Xu, Q.-H. (2013-05-15). Huge enhancement in two-photon photoluminescence of au nanoparticle clusters revealed by single-particle spectroscopy. Journal of the American Chemical Society 135 (19) : 7272-7277. ScholarBank@NUS Repository.
Abstract: Aggregated metal nanoparticles have been known to display significantly enhanced two-photon photoluminescence (TPPL) compared to nonaggregated nanoparticles, which could be utilized to develop platforms for two-photon sensing and imaging applications. Here we have conducted single-particle spectroscopic studies on gold (Au) nanoparticle clusters of different sizes to understand the enhancement mechanisms and explore the limit of maximum achievable enhancement. Our studies show that the TPPL intensity of Au nanoparticle clusters significantly increases from monomer to trimer. The averaged intensity of the Au nanosphere dimers and linear trimers is ∼7.8 × 103 and ∼7.0 × 104 times that of Au nanosphere monomers, respectively. A highest enhancement of 1.2 × 10 5 folds was obtained for the linear trimer. The TPPL spectra of these single Au nanosphere clusters closely resemble their corresponding scattering spectra, suggesting strong correlation between their TPPL with plasmon resonance. The scattering spectra of dimers and linear trimers displayed cos2 dependence on the detection polarization, while their TPPL displayed cos4 dependence on the excitation polarization, which are very similar to Au nanorods. These results suggest that two-photon excitation of dimer and linear trimer is strongly coupled to their longitudinal plasmon resonance modes. These studies help to provide insight on fundamental understanding of the enhancement mechanisms as well as development of biomedical and photonic applications. © 2013 American Chemical Society.
Source Title: Journal of the American Chemical Society
ISSN: 00027863
DOI: 10.1021/ja400364f
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 8, 2018


checked on Feb 13, 2018

Page view(s)

checked on Mar 12, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.