中国物理B ›› 2014, Vol. 23 ›› Issue (4): 47306-047306.doi: 10.1088/1674-1056/23/4/047306

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

Enhanced light absorption of silicon in the near-infrared band by designed gold nanostructures

刘菊, 钟晓岚, 李志远   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-10-21 修回日期:2013-12-05 出版日期:2014-04-15 发布日期:2014-04-15
  • 基金资助:
    Project supported by the National Key Basic Research and Development Program of China (Grant No. 2013CB632704) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. Y1 V2013L11).

Enhanced light absorption of silicon in the near-infrared band by designed gold nanostructures

Liu Ju (刘菊), Zhong Xiao-Lan (钟晓岚), Li Zhi-Yuan (李志远)   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-10-21 Revised:2013-12-05 Online:2014-04-15 Published:2014-04-15
  • Contact: Li Zhi-Yuan E-mail:lizy@aphy.iphy.ac.cn
  • About author:73.20.Mf; 78.67.Bf; 78.20.Bh
  • Supported by:
    Project supported by the National Key Basic Research and Development Program of China (Grant No. 2013CB632704) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. Y1 V2013L11).

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摘要： A scheme to enhance near-infrared band absorption of a Si nanoparticle by placing the Si nanoparticle into a designed gold nanostructure is proposed. Three-dimensional (3D) finite-difference time-domain simulations are employed to calculate the absorption spectrum of the Si nanostructure and maximize it by generating alternate designs. The results show that in the near-infrared region over 700 nm, the absorption of a pure Si nanoparticle is very low, but when the same nanoparticle is placed within an optimally designed gold nanostructure, its absorption cross section can be enhanced by more than two orders of magnitude in the near-infrared band.

关键词: surface plasmon resonance, near-infrared, silicon absorption, finite-difference time-domain optimization

Abstract: A scheme to enhance near-infrared band absorption of a Si nanoparticle by placing the Si nanoparticle into a designed gold nanostructure is proposed. Three-dimensional (3D) finite-difference time-domain simulations are employed to calculate the absorption spectrum of the Si nanostructure and maximize it by generating alternate designs. The results show that in the near-infrared region over 700 nm, the absorption of a pure Si nanoparticle is very low, but when the same nanoparticle is placed within an optimally designed gold nanostructure, its absorption cross section can be enhanced by more than two orders of magnitude in the near-infrared band.

Key words: surface plasmon resonance, near-infrared, silicon absorption, finite-difference time-domain optimization

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

  • 73.20.Mf
78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 78.20.Bh (Theory, models, and numerical simulation)