Before revision: If the hole is blind (a blind hole is a hole that has not broken through on the backside yet) the wafer (often SiN or silicon oxide) is then turned upside down, and exposed with the argon beam.
After revision: /siliconIf the hole is blind (a blind hole is a hole that has not broken through on the backside yet) the wafer (often SiN or silicon oxide) is then turned upside down, and exposed with the argon beam.