news digest ♦ Novel Devices
Nanosys is demonstrating a 55 inch 4K TV utilising QDEF technology at the IHS E&M Quantum Dot Seminar in Seoul, Korea this week. A drop-in optical component for LCDs, QDEF creates a richer, more lifelike colour experience while consuming significantly less power.
Based on a new generation of quantum dots from Nanosys, the 55 inch set on display in Korea achieves about 40% higher colour gamut than commercially available white-LED based 4k televisions while reducing power consumption by more than 35%.
“QDEF is enabling LCD makers to really challenge the newest OLED technology,” says Jason Hartlove, President and CEO of Nanosys. “We are working with display makers to create a new, perfect colour display experience that is more cost effective, efficient and reliable than anything else currently on the market. This is fundamentally changing the economics of high performance displays back in favour of LCD technology, and demand for QDEF has grown to the point that we’ve significantly expanded our manufacturing to keep up.”
Nanosys is working closely with supply chain partners to continue ramping deliveries as demand for QDEF from global display manufacturers increases.
Tiny InAs antennas give long light waves IR vision
The indium arsenide antenna arrays enable the detection of small volumes of materials with a standard infrared spectrometer
University of Illinois at Urbana-Champaign researchers have developed arrays of tiny nano-antennas that can enable sensing of molecules that resonate in the infrared (IR) spectrum.
The antennas are composed of III-V compound semiconductor InAs.
“The identification of molecules by sensing their unique absorption resonances is very important for environmental monitoring, industrial process control and military applications,” says team leader Daniel Wasserman, a professor of electrical and computer engineering. Wasserman is also a part of the Micro and Nano Technology Laboratory at Illinois.
Nanoantennas made of semiconductor InAs can help scientists detect molecules with infrared light (Credit: Daniel Wasserman)
The food and pharmaceutical industries use light to detect contaminants and to ensure quality. The light interacts with the bonds in the molecules, which resonate at particular frequencies, giving each molecule a “spectral fingerprint.” Many molecules and materials more strongly resonate in the IR end of the spectrum, which has very long wavelengths of light - often larger than the molecules themselves.
“The absorption signatures of some of the molecules of interest for these applications can be quite weak, and as we move to nano-scale materials, it can be very difficult to see absorption from volumes smaller than the wavelength of light,” Wasserman says. “It is here that our antenna array surfaces could have a significant impact.”
Other nano-scale antenna systems cannot be tuned to a longer light wavelength because of the limitations of traditional nanoantenna materials. The Illinois team used highly doped semiconductors grown by MBE.
“We have shown that nanostructures fabricated from highly doped semiconductors act as antennas in the infrared,” notes Stephanie Law, a postdoctoral researcher at Illinois and the lead author of the work published in the journal Nano Letters. “The antennas concentrate this very long wavelength light into ultra- subwavelength volumes, and can be used to sense molecules with very weak absorption resonances.”
The semiconductor antenna arrays allow long- wavelength light to strongly interact with nano-scale samples, so the arrays could enhance the detection of small volumes of materials with a standard IR spectrometer - already a commonplace piece of equipment in many industrial and research labs.
The researchers further demonstrated their ability to control the position and strength of the antenna resonance by adjusting the nanoantenna dimensions and the semiconductor material properties.
The group will continue to explore new shapes and structures to further enhance light-matter interaction at very small scales and to potentially integrate these
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www.compoundsemiconductor.net August/September 2013
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