Advanced Near-Infrared Cameras

Many imaging applications in the near-infrared (NIR) region of the spectrum require sensors that see beyond the traditional charge-coupled device (CCD) sensor’s spectral range. A standard uncoated CCD detector cuts off at a wavelength of around 1100 nm, where the silicon becomes transparent. Special wave-shifting coatings can push this cut-off wavelength out to 1600 nm and beyond, but the sensitivity of the coated sensor decreases dramatically. A better detector material is required for many applications that demand high sensitivity and a spectral response out beyond 1600 nm. Indium gallium arsenide (InGaAs) is that material.