title: Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths.
abstract: Luminescence quantum yields (QYs) of gold nanoparticles including nanorods, nanobipyramids and nanospheres are measured elaborately at a 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 resonance peak. A phenomenological model based on the plasmonic resonator concept is proposed to understand the experimental findings. The excitation wavelength dependent QY is attributed to the wavelength dependent coupling efficiency between the free electron 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.
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Guowei
authors.initials: G
authors.lastname: Lu
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn.
authors.forename: Yingbo
authors.initials: Y
authors.lastname: He
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn.
authors.forename: Hongming
authors.initials: H
authors.lastname: Shen
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn.
authors.forename: Jingyi
authors.initials: J
authors.lastname: Zhao
authors.affiliation: ARC Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.
authors.forename: Keyu
authors.initials: K
authors.lastname: Xia
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing 100871, China. guowei.lu@pku.edu.cn and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong