Conversion of evanescent into propagating light in near‐field scanning optical microscopy
Conversion of evanescent into propagating light in near‐field scanning optical microscopy
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DOI：
10.1063/1.362551
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发表时间：
1996-06
影响因子：
3.2
通讯作者：
K. Fukuzawa;H. Kuwano
中科院分区：
文献类型：
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作者：
K. Fukuzawa;H. Kuwano
利用光悬臂梁分析了近场扫描光学显微镜所需要的从逝去光到传播光的转换。光悬臂梁是一种硅悬臂梁，其顶端有一个pn结光电二极管。光悬臂梁尖端将样品中的消逝光转化为传播光。将散射模型和传输模型的理论值与实验值进行了比较。散射模型比传输模型给出的结果更接近实验值。这表明，非传播的逝去光在光悬臂梁尖端被转换为散射光，并且散射光被光电二极管收集。
Conversion of evanescent light into propagating light (as needed in near‐field scanning optical microscopy) is analyzed by means of a photocantilever. The photocantilever is a silicon cantilever with a pn junction photodiode on its tip. The photocantilever tip converts evanescent light from a sample into propagating light. Theoretical values given by scattering and transmission models are compared with our experimental values. The scattering model gives results that are closer to the experimental values than does the transmission model. This indicates that the nonpropagating evanescent light is converted into scattered light at the photocantilever tip, and that the scattered light is collected by the photodiode.