Transparent imaging systems built into spectacle lenses will enable a new generation of eye tracking devices and augmented reality machines.
Sign up for our email newsletter for the latest science newsLight sensitive pixels and the cameras they make possible have transformed modern life. Cameras are pervasive. Smartphones often have several, streets, shops and businesses — even our homes--bristle with them. Humans have become used to the idea that they are constantly recorded by these devices every time they leave their house and often while they are within it.
The technology that makes light sensitive pixels transparent is photodetectors made of graphene-based quantum dots. These devices consist of a layer of graphene — a 2-dimensional sheet of carbon atoms in “chicken wire” formation — covered with dots of lead sulfide. When hit by photons, the dots emit electrons that flow across the graphene sheet to produce a current.
Other organic conductors that are light sensitive, produce smaller signals that need immediate amplification. So the amplifying electronics — which are not transparent — must be near the pixels. This takes up space that would otherwise be used to detect photons and also reduces the transparency of the array.By contrast, Mercier and co say their amplifying electronics can be tucked safely out of the way.
They went on to simulate eye-tracking by projecting a black dot onto the array and using the output to track it.That’s interesting work with potentially powerful applications. “Eye-tracking has a wide range of uses, such as detecting schizophrenia, measuring the comprehension of texts or driving experience, while allowing for a better understanding of memory and commercial choices,” say Mercier and co.
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