In the laser direct write CVD system, the laser energy is applied
to the surface of a substrate material in a vacuum chamber
and creates a localized heating area. Reactive gas (silane
for silicon growth) is delivered to this locally heated area
and therefore decomposes, leaving behind a small amount
of material deposited on the surface. While the material is
being deposited, the piezoelectric stage holding the substrate
moves relative to the focused laser spot, making the conductive
lines into the desired pattern. A schematic illustrating
the experimental setup is shown in Fig. 1.