中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117302-117302.doi: 10.1088/1674-1056/22/11/117302

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

Near-field optical observations of surface plasmon wave interference at subwavelength hole arrays perforated in Au film

李江艳a, 甘霖b, 李志远b   

  1. a International Center for Quantum Materials, Peking University, Beijing 100871, China;
    b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-05-14 修回日期:2013-08-10 出版日期:2013-09-28 发布日期:2013-09-28
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CB922002 and 2013CB632704) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

Near-field optical observations of surface plasmon wave interference at subwavelength hole arrays perforated in Au film

Li Jiang-Yan (李江艳)a, Gan Lin (甘霖)b, Li Zhi-Yuan (李志远)b   

  1. a International Center for Quantum Materials, Peking University, Beijing 100871, China;
    b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-05-14 Revised:2013-08-10 Online:2013-09-28 Published:2013-09-28
  • Contact: Li Jiang-Yan, Li Zhi-Yuan E-mail:yanr163@163.com;lizy@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CB922002 and 2013CB632704) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

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摘要： We image optical near-field patterns at subwavelength circular hole arrays in Au film by using scanning near-field optical microscopy in near-infrared wavelengths. Periodical oscillation features are found in the near-field images at the air/Au interface and exhibit two typical kinds of standing wave oscillation forms at the wavelengths corresponding to the transmission minimum and maximum in the transmission spectrum, and the latter one originates from the excitation and interference of a surface plasmon wave at the metallic hole arrays. Our work indicates that monitoring optical near-field patterns can help to reveal many interesting properties of surface plasmon waves at metallic nanostructures and understand their underlying physical mechanisms.

关键词: surface plasmon waves, near-field pattern, oscillation

Abstract: We image optical near-field patterns at subwavelength circular hole arrays in Au film by using scanning near-field optical microscopy in near-infrared wavelengths. Periodical oscillation features are found in the near-field images at the air/Au interface and exhibit two typical kinds of standing wave oscillation forms at the wavelengths corresponding to the transmission minimum and maximum in the transmission spectrum, and the latter one originates from the excitation and interference of a surface plasmon wave at the metallic hole arrays. Our work indicates that monitoring optical near-field patterns can help to reveal many interesting properties of surface plasmon waves at metallic nanostructures and understand their underlying physical mechanisms.

Key words: surface plasmon waves, near-field pattern, oscillation

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

  • 73.20.Mf
07.79.Fc (Near-field scanning optical microscopes) 52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves))