Article

Plasmonics

, Volume 6, Issue 3, pp 515-519

Plasmonic Interaction Between Silver Nano-Cubes and a Silver Ground Plane Studied by Surface-Enhanced Raman Scattering

  • Mingfang YiAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of ChinaAnqing Teachers College
  • , Douguo ZhangAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China Email author 
  • , Pei WangAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China
  • , Xiaojin JiaoAffiliated withDepartment of Electrical and Computer Engineering, University of Utah
  • , Steve BlairAffiliated withDepartment of Electrical and Computer Engineering, University of Utah
  • , Xiaolei WenAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China
  • , Qiang FuAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China
  • , Yonghua LuAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China
  • , Hai MingAffiliated withDepartment of Optics and Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China

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Abstract

The plasmonic interaction between silver nano-cubes and a silver ground plane with and without a dielectric spacer is studied for surface-enhanced Raman scattering (SERS) for rhodamine 6G (R6G) molecules absorbed onto the silver nano-cubes. Experimental results show that the composite substrates made from silver nano-cubes and the silver ground plane produce a stronger SERS signal than by the cubes alone, due to the plasmonic interaction between the cubes and the film. Numerical simulation is used to verify the plasmonic enhancement of the composite substrate and is consistent with the experimental results. The lowest concentration of R6G molecules which can be detected with the composite substrate is about 10−11 M with our setup.

Keywords

Plasmonic interaction Surface-enhanced Raman scattering (SERS) Local electromagnetic field