"Stratafied"(tm) is the designation for the set of technologies Lumiense Photonics has developed to permit the stacking and bonding of multiple semiconductor wafers containing either photodiode arrays or image acquisition and control circuitry. Further, a Stratafied assembly can include dichroic filters between the wafers to improve spectral band separation over the absorption characteristics of the semiconductor materials. In addition, because the top photodiode layer is free from circuitry and metallizations an efficient anti-reflectance coating can be applied to the input surface. Finally, a dichroic mirror below the last photodiode plane can completely block light from entering the circuit layer to produce a global shutter structure with an extremely high extinction ratio.
To facilitate development of products tailored for specific applications, Lumiense has formed a series of companies and licensed its technologies to each to concentrate efforts of various teams on well-defined market areas.