Plasmonic evolution of atomically size-selected Au clusters by electron energy loss spectrum

Author:

Lu Siqi1,Xie Lin2,Lai Kang3,Chen Runkun45,Cao Lu1,Hu Kuojuei1,Wang Xuefeng6,Han Jinsen3,Wan Xiangang1,Wan Jianguo1,Dai Qing7,Song Fengqi1ORCID,He Jiaqing2,Dai Jiayu3,Chen Jianing458,Wang Zhenlin1,Wang Guanghou1

Affiliation:

1. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China

2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China

3. Department of Physics, National University of Defense Technology, Changsha 410073, China

4. Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China

5. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

6. School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

7. Division of Nanophotonics, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China

8. Songshan Lake Materials Laboratory, Dongguan 523808, China

Abstract

Abstract The plasmonic response of gold clusters with atom number (N) = 100–70 000 was investigated using scanning transmission electron microscopy-electron energy loss spectroscopy. For decreasing N, the bulk plasmon remains unchanged above N = 887 but then disappears, while the surface plasmon firstly redshifts from 2.4 to 2.3 eV above N = 887 before blueshifting towards 2.6 eV down to N = 300, and finally splitting into three fine features. The surface plasmon's excitation ratio is found to follow N0.669, which is essentially R2. An atomically precise evolution picture of plasmon physics is thus demonstrated according to three regimes: classical plasmon (N = 887–70 000), quantum confinement corrected plasmon (N = 300–887) and molecule related plasmon (N < 300).

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Chinese Academy of Sciences

Publisher

Oxford University Press (OUP)

Subject

Multidisciplinary

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