The coupling of laser radiation into the Scanning Probe Microscope jun
ction offers a powerful tool to investigate optical and;spectroscopic
properties of diverse surfaces with high spatial resolution. The study
of strong laser field enhancement at the junction produced by the pro
ximity between the tip and the sample in a laser assisted Scanning Tun
neling Microscope (STM) configuration is a matter of growing interest
due to the broad possibilities opened in the field of nanomodification
, microscopy and spectroscopy of surfaces. In this paper the latest re
sults in field enhancement in a laser assisted STM are reviewed.