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Optical images whose resolution is not limited by diffraction can be created by recording the radiation from a point-like (subwavelength size) probe light source while raster scanning it across an object in immediate proximity. An imaging capability with resolution in the range from 1 to 50 nm has been demonstrated with various types of light sources including luminescence from an STM junction in transmission as well as in reflection emission and in a topographic mode. This paper gives a brief overview of the underlying principles followed by a discussion of a few selected results.
Dieter W. Pohl andJames K. Gimzewski
"Scanning near-field microscopies", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34815
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Dieter W. Pohl, James K. Gimzewski, "Scanning near-field microscopies," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34815