The IA35 is a heterostructure photodiode on an InAs substrate with a relatively wide peak at 2.8µm. The curve of the spectral response can be seen in the image below. The IA35S500S4i is available now. This detector with a 0.5mm chip is designed specifically for uncooled operation and a spectral range of up to 3.5µm (20% cut-off).
