An analysis of heterodyne signals in apertureless scanning near-field optical microscopy

Chin Ho Chuang, Yu Lung Lo

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

This study constructs interference-based model of the apertureless scanning near-field optical microscopy (A-SNOM) heterodyne detection signal which takes account of both the tip enhancement phenomena and the tip reflective background electric field. The analytical model not only provides a meaningful explanation of the image artifacts and errors, but also suggests methods for reducing these effects. It is shown that the detection signal obtained in the heterodyne A-SNOM method has a significantly higher signal-to-background (S/B) ratio than in the homodyne method. It is also shown that the S/B ratio increases as the wavelength of the illuminating light source is increased or the incident angle is reduced. Finally, an inspection reveals two fundamental phenomena which may potentially be exploited to obtain further significant improvements, namely (1) the modulation depth parameter has certain specific values greater than 1; and (2) the AFM tip apparatus using a ramp function.

原文English
頁(從 - 到)17982-18003
頁數22
期刊Optics Express
16
發行號22
DOIs
出版狀態Published - 2008 十月 27

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學

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