  A new technique is presented which enables the fabrication of highly
transparent Josephson junctions in combination with mesoscopic devices. We
utilize a modified AFM tip to plough grooves into superconducting material,
thus defining a weak link. This weak link is made within the superconducting
split-gates, which are used to electrostatically form a conventional quantum
dot and serves as a source of millimeter wave radiation around 100 GHz. We show
the characteristics of typical junctions built and discuss their high-frequency
properties. We find that the millimeter wave emission of the weak link leads to
a bolometric effect in the case of quantum point contact spectroscopy.
