COLOUR IMAGING
Te researchers scrapped the traditional
stacked model, which relies on a stacked structure of three to four layers, and worked out how to use a nano thin layer, a single atom thick, on a chip. Tey did so without diminishing the photodetector’s speed, low- light sensitivity or visibility of the spectrum. Te prototype device can interpret light
ranging from deep ultraviolet to near infrared wavelengths, making it sensitive to a broader spectrum than the human eye. It does this more than 10,000 times faster than the blink of an eye. One of the team’s major challenges was
ensuring electronic and optical properties didn’t deteriorate when the photodetector was shrunk. To combat this they used tin
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‘We managed to engineer a device that packs a powerful punch, despite being thinner than a nanometre’
monosulphide, a low-cost and naturally abundant material. Associate professor Sumeet Walia, the
chief investigator, said: ‘Te material allows the device to be extremely sensitive in low- light conditions, making it suitable for low- light photography across a wide spectrum.’
Need for speed Te development means that this type of technology could be used in new applications. Walia explained: ‘With further development, we could be looking at applications including more effective motion detection in security cameras at night and faster, more efficient data storage.’ Developments have also been taking
place when it comes to colour imaging in the commercial arena, and these look set to prove beneficial, not just for medical, but a host of other applications. JAI is a manufacturer of industrial-grade
cameras for the machine vision market, among others, and has developed a range of multi-sensor area scan and line scan
g OCTOBER/NOVEMBER 2020 IMAGING AND MACHINE VISION EUROPE 19
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