 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Researchers Send 'Heavy Photons' Over World-Record Distances
Pittsburgh PA (SPX) Jun 23, 2005 When light hits a semiconductor material and is absorbed, its photons can become "excitons," sometimes referred to as "heavy photons" because they carry energy, like photons, but have mass, like electrons. Excitons typically exist for only a short time - trillionths of a second--and travel only a few microns before turning back into photons, which are then emitted from the material. In the June 10 issue of the journal Physical Review Letters, scientists from the University of Pittsburgh and Bell Labs, the R&D arm of Lucent Technologies, report that they have designed and demonstrated a two-dimensional semiconductor structure in which excitons exist longer and travel farther than previously recorded. In their paper, titled "Long-Distance Diffusion of Excitons in Double Quantum Well Structures," David Snoke, senior author and associate professor of physics and astronomy at Pitt, and his colleagues report a system in which excitons move freely over distances of hundreds of microns. Their findings open up the possibility of new applications, such as excitonic circuits. The researchers "stretched out" the excitons by pulling them apart with an electrical field. This extended the excitons' lifetimes by a million (up to 30 microseconds) and expanded the distances the excitons traveled (up to a millimeter). They were able to "see" the excitons by observing the emitted photons. The semiconductor structures designed in the experiment are of "world-record quality," said Snoke. The ability to control excitons over long distances could lead to excitonic circuits in which photons are converted directly into excitons, which are then steered around a chip and converted back into photons again at a different location, such as an optical memory device, said Snoke. "It's another tool in our optics toolbox," he said. "We're doing this with semiconductor circuits now designed for moving electrons," he added. "It's a completely new type of control over the system." Other authors of the paper are Zoltan Voros and Ryan Balili, graduate students in Pitt's Department of Physics and Astronomy, and Loren Pfeiffer and Kenneth West of Bell Labs. Community Email This Article Comment On This Article Related Links University of Pittsburgh SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Computer Chip Architecture, Technology and Manufacture Nano Technology News From SpaceMart.com
Toxin Level In Chinese River Still Unsafe
Beijing (AFP) Jan 11, 2006Levels of a cancer-causing chemical found in a Chinese river are still above safety standards after a spill last week, despite earlier official reassurances, state media reported Wednesday. |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
