Infra-Red, In Situ (IRIS) Inspection of Silicon

March 10, 2023 | Electronics
Andrew Huang

Bunnie Huang released an interesting post recently which shows a new way to look into chips without the usual hassle of having to remove, dissolve or grind them down.

The concept is really simple. You modify a digital camera, removing the IR filter, then you shine a 1050nm IR light into the chip. Since silicon is transparent to IR light, it seems to bounce up from the board and you can peer directly inside to inspect them.