Light focusing in linear arranged symmetric nanoparticle trimer on metal film system
Yuxia Tang(唐裕霞)1,2, Shuxia Wang(王蜀霞)1, Yingzhou Huang(黄映洲)1,†, and Yurui Fang(方蔚瑞)3,‡
1 State Key Laboratory of Coal Mine Disaster Dynamics and Control and Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 400044, China; 2 Applied Physics, School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing 400067, China; 3 Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams(Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
Abstract Benefiting from the induced image charge on film surface, the nanoparticle aggregating on metal exhibits interesting optical properties. In this work, a linear metal nanoparticle trimer on metal film system has been investigated to explore the novel optical phenomenon. Both the electric field and surface charge distributions demonstrate the light is focused on film greatly by the nanoparticles at two sides, which could be strongly modulated by the wavelength of incident light. And the influence of nanoparticle in middle on this light focusing ability has also been studied here, which is explained by the plasmon hybridization theory. Our finding about light focusing in nanoparticle aggregating on metal film not only enlarges the novel phenomenon of surface plasmon but also has great application prospect in the field of surface-enhanced spectra, surface catalysis, solar cells, water splitting, etc.
(Interactions of particles and radiation with matter)
Fund: Project supported by the National Key Research and Development Program (Grant No. 2019YFC1906100), the National Natural Science Foundation of China (Grant Nos. 11974067 and 12074054), the Natural Science Foundation Project of CQ CSTC (cstc2019jcyj-msxmX0145, cstc2019jcyj-bshX0042, and cstc2019jcyj-msxmX0828), and the Sharing Fund of Chongqing University’s Large-scale Equipment.
Yuxia Tang(唐裕霞), Shuxia Wang(王蜀霞), Yingzhou Huang(黄映洲), and Yurui Fang(方蔚瑞) Light focusing in linear arranged symmetric nanoparticle trimer on metal film system 2022 Chin. Phys. B 31 017303
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