Fast design of a led with the right shade of whiteSince the introduction of white LED’s, not only the energy consumption of light went down substantially, the LED is also a very versatile light source: from powerful headlights of cars, to house lighting or small solar-powered light sources in areas without a power grid. Although the advantages are clear, designing a white LED with the right specifications still is a tedious ‘trial-and-error’ process. Researchers of the University of Twente, Eindhoven University of Technology and the lighting company Signify now demonstrate a design principle that drastically reduces the time needed to design an white LED: from hours to less than a second, thus improving performance and reducing costs. The researchers present their method in ACS Photonics, of the American Chemical Society.Read more
Cryptography without using secret keysMost security applications, for instance access to buildings or digital signatures, use cryptographic keys that must at all costs be kept secret. That also is the weak link: who will guarantee that the key doesn’t get stolen or hacked? Using a physical unclonable key (PUK) – which can be a stroke of white paint on a surface – and the quantum properties of light, researchers of the University of Twente and Eindhoven University of Technology present a new type of data security that does away with secret keys. They present their method in the journal Quantum Science & Technology.Read more
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Cryptography without using secret keys
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