TE-SHG

A typical experimental system for TE-SHG microscopy basically consists of a pulsed laser, an AEM, and an inverted optical microscope. The system is not very different from the TERS and TE-CARS system described in previous sections. The only difference is the use of an optical filter that selectively passes the SH light. 

One of the most important and interesting features of TE-SHG microscopy is that SH light is emitted not only from a sample but also from a metallic tip (Figure 10.14). Therefore, in order to correctly understand TE-SH images, magnitude correlation of susceptibilities of tip metal (z ip) and sample (z sampie) has to be taken into consideration. When z ampie is sufficiently larger than z , ip (Z tip < Z sampie). one... 

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