Five dimensional nanoprobe photo-absorption spectroscopy

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In order to construct a measurement system, which enables the nanoscale probing of time resolved dynamics of the energy structures of material surfaces, we have developed a new measurement scheme of electric field modulation photo-absorption spectroscopy. The scheme is based on scanning tunneling microscopy using a supercontinuum light generated by ultra-short laser pulses as the wideband light source of Fourier transform interferometer. The performance of the scheme was demonstrated for the energy structure of semiconductor samples.On the other hand, the basic physical processes of measurement of carrier dynamics in semiconductor surfaces by STM and ultra-short laser pulses were analyzed by comparing model simulation data with experimental data. The optimum conditions for reliable measurement were determined.