05 April 2001
05 April 2001
Experiments on a newly created composite material have shown that it bends microwaves passing through it in a direction that seems to defy the laws of physics, scientists said on Thursday, in a discovery that could help in making more advanced lenses and antennas.
The composite, made of fiberglass and copper, caused microwaves shot through it to bend in an opposite direction than the laws of physics predict, making it the first material to have a ``negative index of refraction,'' physicists said in a study appearing in the journal Science.
Electromagnetic radiation -- such as light and microwaves -- passing through ordinary materials is deflected in the same direction, giving those materials a ``positive index of refraction,'' they said. An example is the way light bends when it passes from air to water.
The composite could be useful in developing better antennas and other technology for the cellular communications industry, said physicist Sheldon Schultz, who created the material along with colleagues David Smith and Richard Shelby at the University of California at San Diego.
Although the composite cannot focus visible light, Schultz said he hopes that obstacle can be overcome in the future.
Physicist John Pendry of London's Imperial College has said that a material with a ``negative refraction'' would make possible the construction of a lens capable of focusing light to limits not currently achievable.
Cobra International is celebrating its 40th year and has commissioned a book that will look at 40 key projects and 40 key people that were integral to the company’s growth. ‘Klaus Simmer and The King Cobra: A breakthrough in surfboard design and production technology’ is an extract article from this book and a breakthrough composites product for Cobra, establishing its presence as a manufacturer of high performance windsurf boards and creating global visibility for the Cobra brand.
Technical Fibre Products will showcase its Optiveil nonwovens at China Composites Expo in Shanghai on 5-7 September.