What is the advantages of InGaAs infrared image sensors?
Silicon detectors have a low responsivity with wavelengths higher than 1000 nm. "Infrared" cover a large part of the electromagnetic spectrum. For a part of that spectrum, around ~1µ to ~2µ, InGaAs have a good responsivity and low noise at a reasonable cost. InGaAs detectors are not new, they already existed in the 80s.