Photoluminescence of a single complex plasmonic nanoparticle.
We report detailed investigations of the photoluminescence (PL) generated from an individual gold nanoflower, a highly branched plasmonic nanoparticle. Compared to nanostructures with simple shapes, such as spheres, nanorods, and bipyramids, nanoflowers exhibit more distinct features, i.e., the PL spectra and far-field emission patterns are strongly dependent on the wavelength and polarization of the excitation light. The experimental results are qualitatively explained using theoretical calculations. In addition, the intrinsic PL signal is highly dominated by localized surface plasmon resonances. The crucial role of plasmonic coupling in complex nanostructures during the plasmon-enhanced PL process is highlighted. The findings contribute to a deeper understanding of the PL properties of metallic nanoparticles. This study will be beneficial for several potential applications, including optical imaging and sensing in the fields of materials science and biology.
State Key Laboratory for Mesoscopic Physics, Department of Physics, Beijing 100871, China.
Tianyue
T
Zhang
State Key Laboratory for Mesoscopic Physics, Department of Physics, Beijing 100871, China.
Guowei
G
Lu
State Key Laboratory for Mesoscopic Physics, Department of Physics, Beijing 100871, China.
Hongming
H
Shen
State Key Laboratory for Mesoscopic Physics, Department of Physics, Beijing 100871, China.
Kebin
K
Shi
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Yuanyuan
Y
Jiang
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Dongsheng
D
Xu
State Key Laboratory for Mesoscopic Physics, Department of Physics, Beijing 100871, China.
Qihuang
Q
Gong