Dotty sensor sees in glorious technicolour


By Paul Marks WANT to catch the colours of a rainbow? Then cameras need to ditch their colander-like image sensors. That’s the basic idea behind a new sensor which claims to capture unparalleled amounts of light and colour. Nanoengineer Ted Sargent of the University of Toronto, Canada, realised that the image sensors currently used in digital cameras and cellphones waste most of the light that hits them. The sensors, or complementary metal-oxide semiconductor (CMOS) photodiodes, are built in such a way that metal tracks have to criss-cross their surface. These tracks, which carry signals from the photodiode,
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