The invention relates to a process for sealing plasma-damaged, porous low-k materials on Si substrates, in which self-aligning molecules are applied to the low-k material, and then a diffusion barrier is applied to the low-k material. A laser digitizer imaging system creates a visual three-dimensional image of a dental item such as a tooth or a dental impression. The first programmable transistor includes a first gate terminal, a first source terminal, a first drain terminal, and a first programming terminal. Therefore, it is possible to obtain an accurate control signal based on the sub beams, and also possible to realize an optical pickup device having a preferable recording performance.