Development of near-field vibrational stark spectroscopy

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We have developed a near-field Raman spectroscopic system by combining conducting atomic force microscopy with Raman spectroscopy. Near-field probe tips were fabricated by coating silicon dioxide cantilevers with silver thinfilms via the thermal evaporation method, which enabled us to have efficient tips with both conductivity and high field enhancement. We have also demonstrated subnanometric stabilization of the near-field Raman spectroscopic system under ambient condition. Time-dependent thermal drift of near-field probes was optically sensed at subnanometre scale, and was compensated in real-time. Using the developed system, vibrational stark tuning rate of 4 cm-1/V with 1-propanethiol molecules was demonstrated, which shows the capability of controlling molecular structures and functions on a nanometer scale.