Analytical analysis of modulated signal in apertureless scanning near-field optical microscopy

C. H. Chuang, Y. L. Lo

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

Eliminating background-scattering effects from the detected signal is crucial in improving the performance of super-high-resolution apertureless scanning near-field optical microscopy (A-SNOM). Using a simple mathematical model of the A-SNOM detected signal, this study explores the respective effects of the phase modulation depth, the wavelength and angle of the incident light, and the amplitude of the tip vibration on the signal contrast and signal intensity. In general, the results show that the background-noise decays as the order of the Bessel function increases and that higher-order harmonic frequencies yield an improved signal contrast. Additionally, it is found that incident light with a longer wavelength improves the signal contrast for a constant order of modulation frequency. The signal contrast can also be improved by reducing the incident angle of the incident light. Finally, it is demonstrated that sample stage scanning yields an improved imaging result. However, tip scanning provides a reasonable low-cost and faster solution in the smaller scan area. The analytical results presented in this study enable a better understanding of the complex detected signal in A-SNOM and provide insights into methods of improving the signal contrast of the A-SNOM measurement signal.

原文English
頁(從 - 到)15782-15796
頁數15
期刊Optics Express
15
發行號24
DOIs
出版狀態Published - 2007 11月 26

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學

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