Response to light with laterally varying photon energy distribution is based on position, such as position on a detector of a respective light spot or intensity maximum for a wavelength or photon energy subrange. A layered structure such as a coating over the detector can produce the laterally varying...http://www.google.ca/patents/US7701590?utm_source=gb-gplus-sharePatent US7701590 - Apparatus, methods, devices, and systems in which differences and/or changes in photosensed positions and/or quantities relate to shifts and/or differences in photon energies
