The work for me to do in the lab is fabrication of fiber-based near-field optical probes, which are used for implementing high resolution Raman spectroscopy.
In addition to the fabrication process includes chemical etching and metal coating under vacuum conditions. We aim to measure directly the nanometer-sized amplitude of the NSOM probe when the probe is mounted on a Tuning Fork. We plan to use the "razor blade" method. By moving the razor blade across the image an intensity profile is recorded. This method allows simultaneous measurement of both the tuning fork output signal and the ac component of the optical intensity. Alternative we could use an interferometer set up.
A particular application of this work is to monitor, via nano-Raman, the eventual liquid-solid phase transition that mesoscopic fluid films undergo when subjected to confinement (between the NSOM probe and a solid substrate.
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