Second harmonic generation in aluminum coated near-field fiber probe

Summary form only given. Second-harmonic generation (SHG) is a useful phenomenon not only for far-field spectroscopy but also near-field (NF) spectroscopy to investigate material properties and to exploit nonlinear optical devices. However, investigation of SHG in the fiber probe has not yet been reported in spite of its potential application to frequency conversion by using UV light. We show the cross-sectional profile of the employed fiber probe for SHG. We give a schematic explanation of the probe-to-probe experiment for measuring the spatial distribution of the SH intensity by using the probe.