Methods and apparatus for producing a CMOS image sensor result in a plurality of photo sensitive layers, each layer including: a glass or glass ceramic substrate having first and second spaced-apart surfaces; a semiconductor layer disposed on the first surface of the glass or glass ceramic substrate; and a plurality of pixel structures formed in the semiconductor layer, each pixel structure including a plurality of semiconductor islands, at least one island operating as a color sensitive photo-detector sensitive to a respective range of light wavelengths, wherein the plurality of photo sensitive layers are stacked one on the other, such that incident light enters the CMOS image sensor through the first spaced-apart surface of the glass or glass ceramic substrate of one of the plurality of photo sensitive layers, and subsequently passes into further photo sensitive layers if one or more wavelengths of the incident light are sufficiently long.