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Chin. Phys. B, 2019, Vol. 28(10): 107802    DOI: 10.1088/1674-1056/ab3f99
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Cascaded plasmonic nanorod antenna for large broadband local electric field enhancement

Dou Zhang(张豆), Zhong-Jian Yang(杨中见), Jun He(何军)
Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China
Abstract  

We propose a cascaded plasmonic nanorod antenna for large broadband electric near-field enhancement. The structure has one big gold nanorod on each side of a small two-wire antenna which consists of two small gold nanorods. For each small nanorod, the enhanced and broadened optical response can be obtained due to the efficient energy transfer from its adjacent big nanorod through strong plasmonic near-field coupling. Thus, the electric field intensity of the cascaded antenna is significantly larger and broader than that of the individual small two-wire antenna. The resonant position, field intensity enhancement, and spectral width of the cascaded antenna are highly tunable by varying the geometry of the system. The quantum efficiency of the cascaded antenna is also greatly enhanced compared with that of the small antenna. Our results are important for the applications in field-enhanced spectroscopy.

Keywords:  surface plasmon      optical antenna      electric field enhancement      broadband      cascaded     
Received:  13 June 2019      Published:  05 October 2019
PACS:  78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)  
  73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))  
  42.25.-p (Wave optics)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No. 11704416) and the Hunan Provincial Natural Science Foundation, China (Grant No. 2017JJ3408).

Corresponding Authors:  Zhong-Jian Yang     E-mail:  zjyang@csu.edu.cn

Cite this article: 

Dou Zhang(张豆), Zhong-Jian Yang(杨中见), Jun He(何军) Cascaded plasmonic nanorod antenna for large broadband local electric field enhancement 2019 Chin. Phys. B 28 107802

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