中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2558-2563.doi: 10.1088/1009-1963/15/11/017

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Influence of the probe--sample interaction on scanning near-field optical microscopic images in the far field

李智, 张家森, 杨景, 龚旗煌   

  1. Department of Physics and State Key Laboratory for Mesoscopic Physics,Peking University, Beijing100871, China
  • 收稿日期:2006-03-30 修回日期:2006-04-18 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 90206003, 10374005, 10434020, 10521002, \linebreak \makebox[1.6mm]{}10328407 and 90101027) and the Research Fund for the Doctoral Program of Higher Education of China (Grant No 20040001012).

Influence of the probe--sample interaction on scanning near-field optical microscopic images in the far field

Li Zhi(李智), Zhang Jia-Sen(张家森)†, Yang Jing(杨景), and Gong Qi-Huang(龚旗煌)‡   

  1. Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
  • Received:2006-03-30 Revised:2006-04-18 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 90206003, 10374005, 10434020, 10521002, \linebreak \makebox[1.6mm]{}10328407 and 90101027) and the Research Fund for the Doctoral Program of Higher Education of China (Grant No 20040001012).

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摘要： We have studied the influence of probe--sample interaction in a scanning near-field optical microscopy (SNOM) in the far field by using samples with a step structure. For a sample with a step height of $\sim \lambda $/4, the SNOM image contrast between the two sides of the step changes periodically at different scan heights. For a step height of $\sim \lambda $/2, the image contrast remains approximately the same. The probe--sample interaction determines the SNOM image contrast here. The influence of different refractive indices of the sample has been also analysed by using a simple theoretical model.

关键词: SNOM, probe--sample interaction, near-field scanning optical microscopy

Abstract: We have studied the influence of probe--sample interaction in a scanning near-field optical microscopy (SNOM) in the far field by using samples with a step structure. For a sample with a step height of $\sim \lambda $/4, the SNOM image contrast between the two sides of the step changes periodically at different scan heights. For a step height of $\sim \lambda $/2, the image contrast remains approximately the same. The probe--sample interaction determines the SNOM image contrast here. The influence of different refractive indices of the sample has been also analysed by using a simple theoretical model.

Key words: SNOM, probe--sample interaction, near-field scanning optical microscopy

中图分类号:  (Near-field scanning microscopy and spectroscopy)

  • 68.37.Uv
78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))