Actually, the blue layer is on the top:
http://www.dpreview.com/news/0202/02021102foveonx3tech.asp
However, it isn't for the reason you supppose. The very
physical/electrical charateristic that makes this sensor possible, that
light penetrates and electrically affects silicon at different depths
depending on wavelength, determines the order of the layers.
Tom@xxxxxxxxxxxxx wrote:
On Monday, February 11, 2002 at 23:54, HI100@xxxxxxx
<olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] New image sensor - Foveon" saying:
The native silicon on it's own has best quantum efficiency in the
infrared, so the blue sensor area (volume) will probbly have worse noise
visible at low light levels.
Hmm, maybe they should put the blue sensitive layer at the top.
This is just the reverse of colour film.
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