Near-field imaging of the interference pattern of counterpropagating evanescent waves.
Near-field imaging of the interference pattern of counterpropagating evanescent waves.
复制标题
反向传播倏逝波干涉图案的近场成像。
DOI：
10.1364/ol.24.000747
复制
发表时间：
1999
期刊：
影响因子：
3.6
通讯作者：
E. Bozhevolnaya
中科院分区：
文献类型：
--
作者：
S. Bozhevolnyi;E. Bozhevolnaya
通常认为，测量由两个反向传播的倏逝波形成的强度干涉图案的对比度可以用来表征收集近场显微镜的分辨能力。我们认为，如果光纤探头收集的光以光纤模式的形式传播到探测器，那么这种看法是错误的。使用对称性参数和简单的计算，我们表明，如果一个扩展的光纤探头是轴对称的，并垂直于传播方向，那么测量的对比度应该总是等于干涉图案的对比度。
It is generally accepted that measurement of the contrast of the intensity interference pattern formed by two counterpropagating evanescent waves can be used to characterize the resolving power of a collection near-field microscope. We argue that, if the light collected by a fiber probe propagates toward a detector in the form of guided fiber modes, then this perception is wrong. Using symmetry arguments and simple calculations, we show that, if an extended fiber probe is axially symmetric and oriented perpendicular to the propagation direction, then the measured contrast should always be equal to the contrast of the interference pattern.