Photonic crystals in metal.
Photonic crystals have structures with just the right kind of geometry to prevent the absorption or emission of electromagnetic radiation electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an at wavelengths that fall within a specific range, or band gap. So far, researchers have studied the characteristics of photonic crystals made from electrically insulating materials (SN: 9/25/93, p.199). Now, Eli Yablonovitch Eli Yablonovitch along with Sajeev John, was one of the two physicists who invented the field of photonic crystals in 1987. In addition to pioneering photonic crystals, he was the first to recognize that a strained quantum well laser has a significantly reduced threshold current and Mike Sickmiller of the University of California, Los Angeles UCLA comprises the College of Letters and Science (the primary undergraduate college), seven professional schools, and five professional Health Science schools. Since 2001, UCLA has enrolled over 33,000 total students, and that number is steadily rising. , have started to investigate a metallic photonic crystal consisting of a three-dimensional wire mesh wire mesh, wire netting n → tela metálica with the same geometry as the arrangement of carbon atoms in diamond. Initial results show that this structure has a number of unexpected features, including an extra forbidden band.
COPYRIGHT 1994 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1994, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.
|
Printer friendly
Cite/link
Email
Feedback
Reader Opinion