Canon has received a patent for their 3 layer Foveon sensor technology. They have been working on it since 2011. Up to now, there was little movement or news about this new sensor but looks like they are still trying to make something out of it, eventually. You can read the original article from Egami here.
Patent description (Google translation) :
Patent Publication No. 2013-93553
- Publication date 2013.5.16
- Filing date 2011.10.4
Imaging element of three-layer structure
- Photodiode deep layer (hereinafter, PD) in the charge is diffused into the substrate
- Thus sensitivity is poor red
Canon patent
- I as a photonic crystal of irregular shape, the boundary surface of the PD of red or green,
- In the periodic structure of uneven spacing, less than twice the 1/4 times or more the wavelength of light, or I shall be two times or less 1/2 times or more
- Irregular shape has the properties to be spatially-localized or resonant light
- The incident light is diffracted, it combines with the light of the boundary plane, the resonant
- Prolonged exists than normal, the light becomes easy to be absorbed by the PD Thus
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