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.
Received: 30 March 2006
Revised: 18 April 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
Li Zhi(李智), Zhang Jia-Sen(张家森), Yang Jing(杨景), and Gong Qi-Huang(龚旗煌) Influence of the probe--sample interaction on scanning near-field optical microscopic images in the far field 2006 Chinese Physics 15 2558
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
