›› 2014, Vol. 23 ›› Issue (9): 97303-097303.doi: 10.1088/1674-1056/23/9/097303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Deep-ultraviolet surface plasmon resonance of Al and Alcore/Al2O3shell nanosphere dimers for surface-enhanced spectroscopy

慈雪婷, 吴伯涛, 宋敏, 陈耿旭, 刘岩, 武愕, 曾和平   

  1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • 收稿日期:2014-02-28 修回日期:2014-03-24 出版日期:2014-09-15 发布日期:2014-09-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104079 and 61378033), the National Key Scientific Instrument Project of China (Grant No. 2012YQ150092), the Research Foundation for the Doctoral Program of Higher Education of China (Grant No. 20110076120019), and the State Key Laboratory of Luminescent Materials and Devices at South China University of Technology.

Deep-ultraviolet surface plasmon resonance of Al and Alcore/Al2O3shell nanosphere dimers for surface-enhanced spectroscopy

Ci Xue-Ting (慈雪婷), Wu Bo-Tao (吴伯涛), Song Min (宋敏), Chen Geng-Xu (陈耿旭), Liu Yan (刘岩), Wu E (武愕), Zeng He-Ping (曾和平)   

  1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • Received:2014-02-28 Revised:2014-03-24 Online:2014-09-15 Published:2014-09-15
  • Contact: Wu Bo-Tao E-mail:btwu@phy.ecnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104079 and 61378033), the National Key Scientific Instrument Project of China (Grant No. 2012YQ150092), the Research Foundation for the Doctoral Program of Higher Education of China (Grant No. 20110076120019), and the State Key Laboratory of Luminescent Materials and Devices at South China University of Technology.

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摘要： The localized surface plasmon resonance properties of Al and Alcore/Al2O3shell nanosphere dimers with Al and Al core nanosphere radii of 20 nm and Al2O3 shell of 2 nm in the deep-ultraviolet region have been studied using the finite difference time domain method. The extinction spectra and the electric field distribution profiles of the two dimers for various gap distances between two individual nanospheres are compared with those of the corresponding monomers to reveal the extent of plasmon coupling. It is found that with the interparticle distance decreasing, a strong plasmon coupling between two Al or Alcore/Al2O3shell nanospheres is observed accompanied by a significant red shift in the extinction spectra at the parallel polarization direction of the incident light related to the dimer axis, while for the case of the perpendicular polarization direction, a weak plasmon coupling arises characterized by a slight blue shift in the extinction spectra. The electric field distribution profiles show that benefiting from the dielectric Al2O3 shell, the gap distance of Alcore/Al2O3shell nanosphere dimers can be tailored to < 1 nm scale and results in a very high electric field enhancement. The estimated surface-enhanced Raman scattering enhancement factors suggests that the Alcore/Al2O3shell nanosphere dimers with the gap of < 1 nm gave rise to an enhancement as high as 8.1×107 for interparticle gap=0.5 nm. Our studies reveal that the Alcore/Al2O3shell nanosphere dimers may be promising substrates for surface-enhanced spectroscopy in the deep-ultraviolet region.

关键词: localized surface plasmon resonance, deep ultraviolet, aluminum nanosphere dimers, enhanced spectroscopy

Abstract: The localized surface plasmon resonance properties of Al and Alcore/Al2O3shell nanosphere dimers with Al and Al core nanosphere radii of 20 nm and Al2O3 shell of 2 nm in the deep-ultraviolet region have been studied using the finite difference time domain method. The extinction spectra and the electric field distribution profiles of the two dimers for various gap distances between two individual nanospheres are compared with those of the corresponding monomers to reveal the extent of plasmon coupling. It is found that with the interparticle distance decreasing, a strong plasmon coupling between two Al or Alcore/Al2O3shell nanospheres is observed accompanied by a significant red shift in the extinction spectra at the parallel polarization direction of the incident light related to the dimer axis, while for the case of the perpendicular polarization direction, a weak plasmon coupling arises characterized by a slight blue shift in the extinction spectra. The electric field distribution profiles show that benefiting from the dielectric Al2O3 shell, the gap distance of Alcore/Al2O3shell nanosphere dimers can be tailored to < 1 nm scale and results in a very high electric field enhancement. The estimated surface-enhanced Raman scattering enhancement factors suggests that the Alcore/Al2O3shell nanosphere dimers with the gap of < 1 nm gave rise to an enhancement as high as 8.1×107 for interparticle gap=0.5 nm. Our studies reveal that the Alcore/Al2O3shell nanosphere dimers may be promising substrates for surface-enhanced spectroscopy in the deep-ultraviolet region.

Key words: localized surface plasmon resonance, deep ultraviolet, aluminum nanosphere dimers, enhanced spectroscopy

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures) 78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 78.20.Bh (Theory, models, and numerical simulation)