Characterization of emission from aggregated gold nanoparticles excited nonlinearly by 1560-nm femtosecond laser

Akira Eguchi; Phat Lu; Youngsik Kim; Tom D. Milster

doi:10.1117/1.JNP.11.046007

31 October 2017 Characterization of emission from aggregated gold nanoparticles excited nonlinearly by 1560-nm femtosecond laser

Akira Eguchi, Phat Lu, Youngsik Kim, Tom D. Milster

Author Affiliations +

Journal of Nanophotonics, Vol. 11, Issue 4, 046007 (October 2017). https://doi.org/10.1117/1.JNP.11.046007

Abstract

Nonlinear emission properties of aggregated 50-nm gold nanoparticles (GNPs) excited by a femtosecond laser at 1560 nm are characterized. Aggregate forms are correlated to emission by scanning electron microscope imaging and pattern matching. Broad spectra in the visible region are obtained from aggregated GNPs, and their emission power exhibits a quadratic power dependence and an exponential decay in time due to morphology change. Polarization analysis reveals that longitudinal plasmonic modes play important roles for nonlinear emission. Relationships between brightness and morphology show that a large number of aggregates produce luminescence enhancement but with associated photo damage. It is proposed that characteristics of nonlinear emission from GNPs are explained by plasmon enhanced polarized hot electrons.

Citation Download Citation

Akira Eguchi, Phat Lu, Youngsik Kim, and Tom D. Milster "Characterization of emission from aggregated gold nanoparticles excited nonlinearly by 1560-nm femtosecond laser," Journal of Nanophotonics 11(4), 046007 (31 October 2017). https://doi.org/10.1117/1.JNP.11.046007

Received: 29 July 2017; Accepted: 5 October 2017; Published: 31 October 2017

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