V. Podzorov and M. E. Gershenson
Physical Review Letters
Researchers at Rutgers University in Piscataway, New Jersey have shown that they can change the threshold voltage of organic transistors by exposing them to visible light, making it possible to essentially "reprogram" the transistor. By illuminating a single-crystal organic transistor with visible light and applying a gate voltage at the same time, they can controllably vary the threshold voltage over a wide range. Furthermore, they found that they can do this reversibly many times without deteriorating the characteristics of the transistor. The effect could find many uses in the developing field of organic electronics, for example in developing novel light-recordable smart media and sensors, the authors suggest.
2) The Unusual Origin of Peacock Brown
Y. Li et al.
Physical Review E
Many animals' colors originate from photonic crystals, which reflect specific colors of light as a result of their nanoscopic structures, rather than from pigments, which derive their colors from their chemical composition. The brown in peacocks' tails is a particularly unusual type of photonic crystal coloration, according to research soon to appear in the journal Physical Review E.
Brown is a mixture of light of different colors. Generally, photonic crystals in animal coloring produce pure colors, such as blue, green, yellow or violet. Nevertheless, researchers at Fudan University in Shanghai have found that the brown in peacocks' feathers is indeed due to microscopic structure. The researchers' experiments and analysis show that peacocks' brown microstructures are a good deal more complex than most natural photonic crystals.
Mimicking the photonic crystals in peacock tail feathers could lead to new ways to manipulate light in cutting edge optical
Contact: James Riordon
American Physical Society