By looking at the picture, it is obvious that the laser drilling has damaged the surface, leaving some bullet-like impact debris around the holes.
Investigations are underway to reduce the surface damages.
Once the holes have been made, they have to be filled with material in order to produce electrodes. Presently, completly filling those holes with gold would be very costly, but once smaller holes are made it will be different. Electrical connections Example of preliminary wire bonding performed on one of the square array in order to perform simple performance test. We can see that 2 columns of 4 bond pads have been connected to 2 different contacts. The pretty colors surrounding the bond pads are due to residual resist from an insufficient cleaning of the sample after gold evaporation.