While infrared waves are available in short, mid, and long lengths, most detection devices are unable to harness all three at the same time.
Now Northwestern Engineering’s Manijeh Razeghi and her team have developed a new approach in device design to realize a three-color, shortwave-midwave-longwave infrared photodetector. With the new design, the devices can detect different infrared wavebands by simply varying the applied bias voltage. This could open up a range of potential applications, including infrared color televisions and three-color infrared imaging.
“A device capable of detecting different infrared wavebands is highly desirable in the next generation infrared imaging systems,” said Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science in Northwestern’s McCormick School of Engineering.