Influence of aperture diameter on image contrast and resolution in scanning near-field optical microscopy
Influence of aperture diameter on image contrast and resolution in scanning near-field optical microscopy
复制标题
扫描近场光学显微镜孔径直径对图像对比度和分辨率的影响
DOI：
10.1063/1.364373
复制
发表时间：
1997
影响因子：
3.2
通讯作者：
R. Ulbrich
中科院分区：
文献类型：
--
作者：
J. Schöfer;M. Gregor;P. Blome;R. Ulbrich
研究了孔径对扫描近场光学显微镜成像对比度和分辨率的影响。玻璃-空气界面处的倏逝驻波场用良好表征的铝涂层光纤尖端探测。当孔径超过某一临界值时，图像对比度会显著下降。数值模拟的概念的强度传递函数，使用的轴向分量的坡印亭矢量内的探头表明，这种现象是增加的影响，通过探头的功率传输的高阶波导模式的结果。它已被证明，驻波图案是方便和可靠的参考装置，为个人探头表征和量化其分辨率。
The influence of aperture diameter on image contrast and resolution in scanning near-field optical microscopy has been investigated. Evanescent standing wave fields at glass–air interfaces were probed with well-characterized aluminum-coated fiber tips. A strong decrease in image contrast was found when the aperture diameter exceeds a critical value. Numerical simulations with the concept of an intensity transfer function using the axial component of the Poynting vector inside the probe demonstrate that this phenomenon is the result of the increasing influence of higher-order waveguide modes on power transmission through the probe. It has been shown that standing wave patterns are convenient and reliable reference devices for individual probe characterization and quantification of their resolving power.