期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.163901
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP18H05205, JP17H01041, JP19H02737, JP19H04667]
- National Science Foundation of China (NSFC) [11527901]
- National Key Research and Development Program of China [2018YFA0704404]
- Nanotechnology Platform (Hokkaido University)
- Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials (Five-Star Alliance) of MEXT
- Center for Emergent Functional Matter Science of National Chiao Tung University from the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project, Ministry of Education (MOE) in Taiwan
Near-field enhancement and dephasing time play critical roles in several applications of localized surface plasmon resonance. Here, using an example gold dimer system, we reveal the correlation between the near-field enhancement and dephasing time via time-resolved photoemission electron microscopy. Compared with isolated particles, dimers with small gap sizes show stronger near-field enhancement and shorter dephasing times. These results are well reproduced by numerical simulations and further explained by a coupled dipole approximation model. The roles of near- and far-field coupling and plasmon localization in balancing near-field enhancement and dephasing time are also unveiled.
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