When grown on a substrate of lithium aluminum oxide, gallium nitride nanowires are triangular in cross section.
The cross section of gallium nitride nanowires grown on a magnesium oxide substrate is hexagonal. Although compositionally identical, the electronic properties of nanowires differ with different crystal orientations.
A significant breakthrough in the development of the highly prized semiconductor gallium nitride as a building block for nanotechnology has been achieved by a team of scientists with the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California at Berkeley.
For the first time ever, the researchers have been able control the direction in which a gallium nitride nanowire grows. Growth direction is critical to determining the wire’s electrical and thermal conductivity and other important properties.
"Our results will come as a surprise to those who have said that growth direction can’t be controlled, that you get what you get when you grow semiconductor nanowires," says Peidong Yang, a chemist with Berkeley Lab’s Materials Sciences Division and a professor with UC Berkeley’s Chemistry Department, who led the research.
Lynn Yarris | EurekAlert!
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In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
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The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
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An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
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