Invention allows clear photos in dim light

May 30, 2013
New sensor a thousand times more sensitive than current camera sensors.

Cameras fitted with a new revolutionary sensor will soon be able to take clear and sharp photos in dim conditions, thanks to a new image sensor invented at Nanyang Technological University (NTU).

The new sensor made from graphene, is believed to be the first to be able to detect broad spectrum light, from the visible to mid-infrared, with high photoresponse or sensitivity. This means it is suitable for use in all types of cameras, including , traffic speed cameras, satellite imaging and more.

Not only is the graphene sensor 1,000 times more sensitive to light than current imaging found in today's cameras, it also uses 10 times less energy as it operates at lower voltages. When mass produced, graphene sensors are estimated to cost at least five times cheaper.

Graphene is only one-atom thick and is made of pure arranged in a . It is known to have a among other properties such as and flexibility.

The of the graphene sensor, Assistant Professor Wang Qijie, from NTU's School of Electrical & Electronic Engineering, said it is believed to be the first time that a broad-spectrum, high photosensitive sensor has been developed using pure graphene.

His breakthrough, made by fabricating a graphene sheet into novel nano structures, was published this month in Nature Communications, a highly-rated research journal.

"We have shown that it is now possible to create cheap, sensitive and flexible photo sensors from graphene alone. We expect our innovation will have great impact not only on the consumer imaging industry, but also in and communication industries, as well as the mid-infrared applications," said Asst Prof Wang, who also holds a joint appointment in NTU's School of Physical and Mathematical Sciences.

"While designing this sensor, we have kept current manufacturing practices in mind. This means the industry can in principle continue producing camera sensors using the CMOS (complementary metal-oxide-semiconductor) process, which is the prevailing technology used by the majority of factories in the electronics industry. Therefore manufacturers can easily replace the current base material of photo sensors with our new nano-structured graphene material."

If adopted by industry, Asst Prof Wang expects that cost of manufacturing imaging sensors to fall - eventually leading to cheaper cameras with longer battery life.

How the Graphene nanostructure works

Asst Prof Wang came up with an innovative idea to create nanostructures on graphene which will "trap" light-generated electron particles for a much longer time, resulting in a much stronger electric signal. Such electric signals can then be processed into an image, such as a photograph captured by a digital camera.

The "trapped electrons" is the key to achieving high photoresponse in graphene, which makes it far more effective than the normal CMOS or CCD (charge-coupled device) image sensors, said Asst Prof Wang. Essentially, the stronger the electric signals generated, the clearer and sharper the photos.

"The performance of our graphene sensor can be further improved, such as the response speed, through nanostructure engineering of graphene, and preliminary results already verified the feasibility of our concept," Asst Prof Wang added.

This research, costing about $200,000, is funded by the Nanyang Assistant Professorship start-up grant and supported partially by the Ministry of Education Tier 2 and 3 research grants.

Development of this sensor took Asst Prof Wang a total of 2 years to complete. His team consisted of two research fellows, Dr Zhang Yongzhe and Dr Li Xiaohui, and four doctoral students Liu Tao, Meng Bo, Liang Guozhen and Hu Xiaonan, from EEE, NTU. Two undergraduate students were also involved in this ground-breaking work.

Asst Prof Wang has filed a patent through NTU's Nanyang Innovation and Enterprise Office for his invention.

The next step is to work with industry collaborators to develop the sensor into a commercial product.

Explore further: Imec demonstrates broadband graphene optical modulator on silicon

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julie_cochrane_589
not rated yet Jun 02, 2013
It has battlefield applications. Dusk-vision or dawn-vision goggles, sharp and with good color vision, could further bridge the in-between range between regular vision and night vision. Yes, I understand that this is a sensor, not a lens. "Goggles" that are really a wrap-around screen for sensor-obtained data are an obvious next-gen device. Goggles that are a wrap-around screen could seamlessly shift between bright light, regular light, low light, and infrared vision modes by enhancing and interpreting data. It could have a hybrid setting of low-light vision enhanced using infrared data.

By going to a screen and sensor setup for goggles, users could have their full range of peripheral vision (wide, wrapped screen), rather than the current approximation provided by four-tube night vision goggles. By placing sensors on the front, sides, top, and rear of the helmet and providing a toggle setting, users could get a 360 degree (plus up) view while remaining still.
julie_cochrane_589
not rated yet Jun 02, 2013
Since you'd have to make screen and image processing "goggles" to take advantage of this sensor, there are all kinds of additional things functions you could add to the tech without making it unwieldy. It could be a good thing in a humanitarian sense, because the move to screen-and-sensor would make it possible to record during action, improving accountability on all sides.
cyberCMDR
not rated yet Jun 06, 2013
I could see this being incorporated into devices like Google glasses, to overlay features from non-visible spectra (like IR) onto the visual scene. Could have interesting applications in medicine, by extending or emphasizing specific light frequencies during diagnosis. It'd be nice if they could extend the range into T-waves for this purpose.

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