optique

Sum-Frequency Generation (SFG) is an optical phenomenon, wherein two photons impinge on a sample surface and generate a third photon at the sum of their frequency.

Two research groups at ETH Zurich have joined forces to develop a novel light detector. It consists of two-dimensional layers of different materials that are coupled to a silicon optical waveguide. In the future, this approach can also be used to make LEDs and optical modulators.