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quantum dots Features
Ones to Watch
IEEE Photonics Society Awards The Young Investigator Award honors an individual who has made outstanding technical contributions to photonics prior to his or her 35th birthday. The 2011 Young Investigator is Hatice Altug, an assistant professor in the electrical and computer engineering department at Boston University. She is recognized “for contributions on nanoplasmonics and integrated nanofluidics for biological sensing and spectroscopy.” According to the IEEE, Altug also is...
Photonics Spectra, August 2011
Quantum Dots Set to Permeate the Next Generation of Displays
A veritable explosion of display-centric devices – new cell phones, handheld games, tablet computers and televisions in a multitude of sizes and dimensionality (2-D, 3-D … n-D!) is coming. Spurred on by ecologically minded consumers...
Photonics Spectra, May 2011
Using SBIRs as a Platform for Success
Perseverance is the most important factor in garnering a Small Business Innovation Research (SBIR) award, according to Brimrose Corp.’s founder and CEO. And he should know. In 1984, Dr. Ron Rosemeier found himself at the end of his postdoc...
Photonics Spectra, May 2011
Lasers Gone Dotty
“You’re going to start seeing the deployment of these devices in the next three years,” said Sylvain Charbonneau, applications technologies director for the microstructural sciences institute of Canada’s Ottawa-based National...
Photonics Spectra, February 2011
Bending Light at will with Transformation Optics
Invisibility cloaks get all the publicity, but they may just be the beginning if the promise of transformation optics can be realized. The discipline could lead to smaller photonic and electronic devices and more cost-competitive solar cells –...
Photonics Spectra, May 2010
Quantum Dots Are Finding Their Place in the World
There has been a panoply of research into the next big thing in quantum dots – those semiconducting artificial atoms that are ubiquitous in fluorescence imaging, biological and chemical sensing, and display applications. Quantum dots of more...
Photonics Spectra, April 2010
Other Trends: But wait – there’s more … !
Well, now. You’ve read the previous articles covering the ongoing and upcoming trends in lasers, optics and imaging, but you’re probably thinking that there’s more to photonics than those technologies. You are correct; there is much more to the...
Photonics Spectra, January 2010
The road to solar cell supremacy
The silicon traditionally used to make solar panels is costly and inefficient at converting sunlight into electricity, experts say, yet it remains the material most commonly used to make solar panels. “This sounds rather ugly, but silicon is the...
Photonics Spectra, October 2009
Particles Could Enable Tougher Encryption
As we search for ways to reduce our reliance on fossil fuels, solar cells have become ever more attractive. However, existing solar cells do not convert solar energy to electricity as efficiently as they could. A type of material called “quantum...
Photonics Spectra, August 2008
Building Quantum Dots Slowly
Quantum dots are small, with sizes measured in nanometers. And the size is important because it determines optical properties such as the emission peak of the particle. Bigger quantum dots have redder emission peaks. The problem with engineering the...
Photonics Spectra, July 2008
Determining the Composition of Quantum Dots from Top to Bottom
Quantum dots may shine, but shedding light on their make-up has proved to be difficult because they are small, with sizes in the tens of nanometers. Several analysis techniques average over many quantum dots, smoothing out possible variations....
Photonics Spectra, July 2008
Putting All of the Sunshine to Work in Solar Cells
Despite extensive research and development, solar cells still fall woefully short of perfection. Commercially available units convert only about 15 percent of the light that falls on them into electricity. Now a team from the University of Notre...
Photonics Spectra, May 2008
The Fuss About Quantum Dots
It is hard to think about a life without semiconductor technology: The entire global information and communications infrastructure is based on semiconductors, and in every one of these applications, size matters. To create computer chips that...
Photonics Spectra, January 2008
Suspended in Film and Placed Over Microcavities, Quantum Dots Become Brighter
According to a group of researchers comprising members from Georgia Institute of Technology in Atlanta, from Iowa State University in Ames and from Agiltron Inc. of Woburn, Mass., suspended quantum dots are brighter because they are removed from the...
Photonics Spectra, November 2007
Tuning LEDs Is Like Mixing Paints
To get the right light for displays and other devices, you need the proper mix of red, green and blue. Now a team from MIT in Cambridge, Mass., has demonstrated that the same idea can be applied when making LEDs using quantum dots. By using the...
Photonics Spectra, September 2007
A Crane for Very Small Construction Sites
It is always best to have the right tool for the job at hand. Unfortunately, researchers investigating the high-resolution positioning of single nanoparticles have lacked the proper equipment. As a result, they have not been able to controllably...
Photonics Spectra, June 2007
Turning Quantum Dots into Tiny ‘Lightbulbs’
For anyone seeking a really small light source, researchers at MIT in Cambridge, Mass., have good news. The group has embedded quantum dots in structures similar to organic LEDs and has demonstrated light emission from single quantum dots at room...
Photonics Spectra, March 2007
Dots Within Dots May Hit the Spot
Like nested dolls, quantum dots can reside inside microspheres. Quantum dots are a few nanometers in diameter and have bright, size-dependent emission. A single wavelength can be used to excite dots of different sizes, making multiplexing possible....
Photonics Spectra, June 2006
PbTe Quantum Dots Assembled into Superlattices and Glassy Films
A team of investigators from IBM’s T.J. Watson Research Center in Yorktown Heights, N.Y., Michigan State University in East Lansing and Columbia University in New York has developed techniques for the solution-phase synthesis of PbTe quantum dots...
Photonics Spectra, April 2006
Microscopy Tip Enhances Quantum
Quantum dots are valuable as fluorophores because they have a broad excitation spectrum and a relatively narrow emission spectrum that depends on the size of the particles. Because of these properties and their stability, they are finding...
Photonics Spectra, January 2006
Heat-Transfer Fluids Cut Cost of Quantum Dots
Quantum dots may be tiny, but they are hugely important for their optoelectronic properties. A drawback, however, is that they typically cost thousands of dollars per gram. Approximately 90 percent of the expense of quantum dots lies in the cost...
Photonics Spectra, November 2005
Solid Immersion Microscopy Images Quantum Dots
Researchers at Boston University and at the National Institute of Standards and Technology in Boulder, Colo., have used a lens that increases numerical aperture with solid immersion microscopy to collect photoluminescence spectra from individual...
Photonics Spectra, October 2005
Optically Active Quantum Dots Embedded in Nanowires
Investigators at the Swiss Federal Institute of Technology in Zurich have reported the fabrication of quantum dots in nanowires that display a level of brightness an order of magnitude higher than self-assembled InAs dots. They suggest that the work...
Photonics Spectra, August 2005
How Can Quantum Dots Be Used?
Quantum dots are so versatile that most of their applications have not yet been realized. A few in development are: Solar cells. Solar cells made from silicon can be stable and efficient, but they are expensive to make. Solar cells that employ...
Photonics Spectra, July 2005
Quantum Dots: Small Structures Poised to Break Big
Imagine a mechanical part that can tell when it is worn out. Or an ink that is impossible to counterfeit. Or an infrared paint that can help to distinguish friends from enemies using night-vision equipment. These seemingly unconnected...
Photonics Spectra, July 2005
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