High-performance infrared cameras are crucial for civilian and military applications such as night-vision goggles and search-and-rescue operations. Existing cameras usually fall into one of two types: active cameras, which use an invisible infrared source to illuminate the scene, usually in the near or short-wavelength infrared; and passive cameras, which detect the thermal radiation given off by a warm object, typically in the mid- or long-wavelength infrared, without the need for any illumination. Both camera types have advantages and disadvantages in the field.
Integrating both modes of imaging into a single camera would open new possibilities — but doing so has proven challenging. Until now, dual-mode active and passive infrared cameras needed either two different infrared detectors or complex controllable filters to accommodate the different wavelengths, and then required additional signal processing to reconstruct a single image from the two modes.
However, in a move that may change the way we look a two-color imaging, researchers at the Northwestern University's Center for Quantum Devices have now found a way to integrate active and passive infrared imaging capability into a single chip. This opens the way to lighter and simpler dual-mode active/passive cameras with lower power dissipation.
A paper about the findings, "Active and Passive Infrared Imager Based on Short-Wave and Mid-Wave Type-II Superlattice Dual-Band Detectors," was published January 1 in the journal Optics Letters. The work was led by Manijeh Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science in Northwestern's McCormick School of Engineering and Applied Science.
The researchers achieved this feat by engineering the quantum properties of novel semiconductor materials called the indium arsenide/gallium antimonide (InAs/GaSb) type-II superlattices. Researchers at the center have been pioneering the development of type-II superlattices as a superior replacement of aging mercury-cadmium-telluride (HgCdTe) infrared camera technology in terms of both performance and cost.
Using the unique band-structure engineering capabilities of type-II superlattices, they have developed a new structure incorporating two different superlattices with different layer spacings, thus enabling detection with a cutoff wavelength of either 2.2µm (active mode) or 4.5µm (passive mode). This new device can simply switch from passive to active mode by a very small change in bias.
Northwestern University: http://www.northwestern.edu
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
The risk posed to aircraft by airborne volcanic ash is as bad as ever, but airlines are better equipped to spot and avoid trouble---and save money---than they were four years ago.
Car accidents kill more than 30,000 people every year. Vehicles equipped with vehicle-to-vehicle technology, an onboard short-range radio device, are expected to save lives. Jeff Pegues reports.
Researchers say personal data can be intercepted in six out of seven popular Android apps, and iOS could be vulnerable too
Researchers find cheap way to split water and produce clean energy
NASA's grease-fuelled hybrid aircraft seems to have been inspired by a magical movie car
The search giant is automatically building Knowledge Vault, a massive database that could give us unprecedented access to the world's facts
Verizon's network beats its competitors nationwide, according to RootMetrics' independent network testing
V2V technology, which would allow cars to communicate wirelessly and prevent crashes, is in the planning stages
A probe that sniffs the aroma of dollars is being developed to help US-Mexico border police catch smugglers.
Who cares about Satoshi Nakamoto? Someone else has made Bitcoin what it is and has the most power over its destiny.