11 January 2017 Luminescence quantum yields of gold nanoparticles varying with excitation wavelength
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Luminescence quantum yields (QYs) of gold nanoparticles including nanorods, nanobipyramids and nanospheres are measured elaborately at single nanoparticle level with different excitation wavelengths. It is found that the QYs of the nanostructures are essentially dependent on the excitation wavelength. The QY is higher when the excitation wavelength is blue-detuned and close to the nanoparticles’ surface plasmon resonant peak. A phenomenological model based on plasmonic resonator concept is proposed to understand the experimental findings. The excitation wavelength dependent of QY is attributed to the wavelength dependent coupling efficiency between the free electrons oscillation and the intrinsic plasmon resonant radiative mode. These studies should contribute to the understanding of one-photon luminescence from metallic nanostructures and plasmonic surface enhanced spectroscopy.
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Yuqing Cheng, Yingbo He, Jingyi Zhao, Hongming Shen, Keyu Xia, Guowei Lua, and Qihuang Gong "Luminescence quantum yields of gold nanoparticles varying with excitation wavelength", Proc. SPIE 10027, Nanophotonics and Micro/Nano Optics III, 1002715 (11 January 2017); doi: 10.1117/12.2244283; https://doi.org/10.1117/12.2244283

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