“…The other ordinate solid form of carbon, the graphite, thanks to its high electrical conductivity (~1.3×10 3 S/cm) is suitable for the realization of bulk conductors even if good performances have been demonstrated in the form of thin layer for the fabrication also of conductive strips, array and pads in alternative to metallization [4,5] and for buried contacts in 3D detector architectures [6,7]. The fabrication of amorphous or nano-graphite pillars and micro-channels inside the bulk diamond volume has been already introduced together with the electrical characteristics using different graphitization approaches [8][9][10], although only laser writing with ultra-short pulses allows local graphitization of the diamond bulk at any depth and along arbitrary 3D trajectory [8,11]. Nevertheless, power density control, graphitization rate and aspect ratio are very critical items to avoid mechanical cracks along the graphite/diamond interface where electronic active defects, with strong charge carrier recombination capability, could be generated by thermal stress and volume expansion.…”