Yesterday the question How do non-mechanical solid-state optical switches work? was closed as off-topic. I don't quite understand why, as questions about physics lab equipment are considered on-topic. In this particular case it is more about identifying a physical effect and therefore of interest for a broader community.
Furthermore I think it shouldn't be migrated to electronics.SE, reverseengineering.SE or likewise, because devices like the described one are usually produced by high-tech companies which employ physicists to a large extent, hence it is quite likely that someone active on this site knows an answer to this.
The question is also not too broad – it wouldn't have 0 answers then. I would start a reopen voting if I had enough reputation on this site, because I think this question has great potential to attract a high-quality useful answer.