Light induced electrostatic force spectroscopy: Application to local electronic transitions in InN epifilms

A technique based on electrostatic force microscopy in which light is used to change the charge states of the local region in a solid is introduced and demonstrated. This technique provides a unique feature that it could be used to probe local electronic transitions of a solid in a submicron scale and it is also applied to study the local electronic structure in InN epifilms.