Wireless nanowire lasers absorb infrared, emit blue light
So, where will these be used? I’ve no idea at this point, and I don’t really care—I just love the physics. More seriously, it takes a very bright light to turn a laser on like this (think ~1TW/cm2), so the applications will certainly be niche.
Nano Letters, 2019, DOI: 10.1021/acs.nanolett.9b00510