Josephson Junctions defined by a Nano-Plough
  We define superconducting constrictions by ploughing a deposited Aluminum film with a scanning probe microscope. The microscope tip is modified by electron beam deposition to form a nano-plough of diamond-like hardness, what allows the definition of highly transparent Josephson junctions. Additionally a dc-SQUID is fabricated to verify appropriate functioning of the junctions. The devices are easily integrated in mesoscopic devices as local radiation sources and can be used as tunable on-chip millimeter wave sources. 
B. Irmer, R.H. Blick, F. Simmel, W. Goedel, H. Lorenz and J.P.   Kotthaus