"Single-crystalline germanium nanomembrane photodetectors on a foreign substrate" publishe

Powerful new photodetector can enable optoelectronics advances

Tuned to absorb specific light wavelengths, the new photodetector consists of nanocavities sandwiched between a ultrathin single-crystal germanium top layer and reflective silver on the bottom.

https://www.engr.wisc.edu/powerful-new-photodetector-can-enable-optoelectronics-advances/