A breakthrough by an Australian collaboration of researchers could make infra-red technology easy-to-use and cheap, potentially saving millions of dollars in defence and other areas using sensing devices, and boosting applications of technology to a host of new areas, such as agriculture.
Infra-red devices are used for improved vision through fog and for night vision and for observations not possible with visible light; high-quality detectors cost approximately $100,000 (including the device at the University of Sydney) some require cooling to -200°C.
Now, research spearheaded by researchers at the University of Sydney has demonstrated a dramatic increase in the absorption efficiency of light in a layer of semiconductor that is only a few hundred atoms thick – to almost 99 percent light absorption from the current inefficient 7.7 percent.
The findings will be published overnight in the high-impact journal Optica.
Co-author from the University of Sydney’s School of Physics, Professor Martijn de Sterke, said the team discovered perfect thin film light absorbers could be created simply by etching grooves into them.
“Conventional absorbers add bulk and cost to the infrared detector as well as the need for continuous power to keep the temperature down. The ultrathin absorbers can reduce these drawbacks,” Professor de Sterke said.
“By etching thin grooves in the film, the light is directed sideways and almost all of it is absorbed, despite the small amount of material – the absorbing layer is less than 1/2000th the thickness of a human hair,” he said.
Co-lead author Dr Björn Sturmberg, who carried out the research as a PhD student at the University of Sydney with the support of the Australian Renewable Energy Agency, said the findings did not rely upon a particular material but could be applied to many naturally occurring weak absorbers.
“There are many applications that could greatly benefit from perfectly absorbing ultra-thin films, ranging from defence and autonomous farming robots to medical tools and consumer electronics,” Dr Sturmberg said.
The Director of Australia’s National Computational Infrastructure (NCI) and co-author, of the paper, Professor Lindsay Botten, said the structures were much simpler to design and fabricate than using existing thin film light absorbers, which required either complex nanostructures, meta-materials and exotic materials or difficult-to-create combinations of metals and non-metals.
“There are major efficiency and sensitivity gains to be obtained from making photo-detectors with less material,” he said.
Learn more: Optics breakthrough to revamp night vision
The Latest on: Night vision
via Google News
The Latest on: Night vision
- Some creatures see the light, even at night on February 20, 2019 at 11:19 pm
Whether in the movies, on television or in person, just about everyone is familiar with the ghostly green images portrayed by night vision equipment that helps humans see in the dark. This is relative... […]
- Astronics Max-Viz 2300 Enhanced Vision System Receives Amended STC for Leonardo Helicopters on February 19, 2019 at 8:35 pm
The amendment upgrades the wiring package to include VIVISUN® Switches for more effective mission utilization with NVGs (Night Vision Goggles) in search & rescue, emergency medical services ... […]
- The global automotive night vision system market is estimated to generate revenues of around $3 billion by 2024 on February 18, 2019 at 6:15 pm
Developed countries such as the US, Japan, the UK, Germany, and France are some of the leading regions for these systems in the global market. The electrification of vehicles in the form of powertrain ... […]
- Top Report on Night Vision Surveillance (IR) Cameras Market - Defense and Public Sector Exhibits Highest Deployment ,Future Scenario on February 18, 2019 at 5:52 pm
As the situation surrounding global security worsens, the demand for night vision surveillance cameras is expected to rise, says TMR. The increasing demand for secured borders, secured living premises ... […]
- Color night vision technology could revolutionize how we see in the dark on February 18, 2019 at 7:38 am
When we think of night vision, our minds automatically turn to grainy black and green images. Today, things have begun to change, and color night vision is slowly creeping into the mainstream. The Dri... […]
- Night Vision Devices market challenges and drivers illuminated by new report on February 16, 2019 at 2:18 am
This report details the Night Vision Devices Market Demand, Growth, Opportunities and Analysis Of Top Key Player Forecast To 2025. These players include Armasight, ATN, BAE Systems, Elbit FLIR Systems ... […]
- Graphene-based wearables for health monitoring, food inspection and night vision on February 15, 2019 at 4:50 pm
Scientists have developed dozens of new graphene-based prototypes. These technologies aim to turn mobile phones into life saving devices. The first of ICFO's devices on display will allow customers to ... […]
- Ring adds color night vision to wired security devices and HDR to wireless ones on February 14, 2019 at 2:00 pm
Amazon’s Ring just added color night vision to all of the brand’s wired smart home security devices. Ring’s battery-operated security devices will get color night vision later but will be the first wi... […]
- How to Get the Night Vision Goggles in Metro Exodus on February 13, 2019 at 3:14 pm
If you want to survive in the harsh world of Metro Exodus then you’ll want to pick up a pair of Night Vision Goggles. Found in two locations, these goggles will help you see in the dark, making ... […]
- Ring to add colour night vision to its Video Doorbells and cameras on February 13, 2019 at 1:34 am
Ring will soon update its Video Doorbells and security cameras with a new feature: full colour night vision. At present, the night vision mode on Ring devices is monochrome. It only shows the outside ... […]
via Bing News