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Abstract
In this paper a probe of an atomic force microscope (AFM) served as a detector of optical radiation. We investigated absorption of optical radiation in the visible range by commercially available Si and Si3N4 probes. It has been shown that the radiation in the far field is mainly absorbed in the probe tip. By scanning a laser beam with a diameter of ∼ 0.7 microns by the AFM probe, a lateral resolution of ∼ 1.5 microns was demonstrated. Numerical modeling of evanescent wave absorption by AFM probes showed enhancement of the absorption in the probes as compared with a flat surface. A Si3N4 probe more effectively absorbs the evanescent radiation.
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1 Ioffe Institute, 26 Politekhnicheskaya str., St. Petersburg 194021, Russia
2 Ioffe Institute, 26 Politekhnicheskaya str., St. Petersburg 194021, Russia; ITMO University, 49 Kronverksky pr., St. Petersburg 197101, Russia
3 Saint Petersburg National Research Academic University of RAS, 8 Khlopina str., St. Petersburg 194021, Russia