Nanohybrids Near-Field Optical Microscopy: From Image Shift to Biosensor Application

Figure 2

(a) Angular diagram setup. A laser light is injected into a SNOM tip and a photomultiplier tube collects the emitted light, scanning the region in front of the tip at 180°. The SNOM tip is then rotated at different angles around itself and the scan repeated. (b) Typical angular diagram of a good quality SNOM tip. P.M refers to photomultiplier tube.

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