Artificial material advances super-fast computers
Posted on 26/01/2011
Artistic impression of metamaterial structure
An international team of scientists led by King’s College London has taken a step closer towards developing optical components for super-fast computers and high-speed internet services of the future. This has the potential to revolutionise data processing speeds by transmitting information via light beams rather than electric currents.
The researchers are studying the science of ‘nanoplasmonic devices’ whose key components are tiny nanoscale metal structures, more than 1000 times smaller than the size of a human hair, that guide and direct light.
Information is routinely sorted and directed in different directions to allow computing, internet connections or telephone conversations to take place. At present, however, computers process information by encoding it in electric signals.
It would be much faster to process and transmit information in the form of light instead of electric signals, but until now, it has been difficult for the light beams to be ‘changed’, that is to interact with other beams of light, while travelling through a material, and this has held up progress.
The scientists have solved this by designing a new artificial material, which allows light beams to interact efficiently and change intensity, therefore allowing information to be sorted by beams of light at very high speeds. The structure of the tailor-made material is similar to a stack of nanoscale rods, along which light can travel and, most importantly, interact. New generation of data processing machines
Professor Anatoly Zayats, in the Department of Physics at King’s, explains: ‘If we were able to control a flow of light in the same way as we control a flow of electrons in computer chips, a new generation of data processing machines could be built, which would be capable of dealing with huge amounts of information much faster than modern computers
‘The new material we have developed, often called ‘metamaterial’, could be incorporated into existing electronic chips to improve their performance, or used to build completely new all-optical chips and therefore revolutionise data processing speeds
‘While there are many challenges to overcome, we would anticipate that in the future this faster technology could be in our PCs, mobile phones, aeroplanes and cars, for example
Other members of the team involved in this latest research include Argonne National Laboratory in the USA; University of North Florida; University of Massachusetts at Lowell; and Queen’s University of Belfast in the UK.
The Engineering and Physical Sciences Research Council (EPSRC) is funding the £6 million research programme at King’s, Queen’s University Belfast and Imperial College London.
The research is published in the journal Nature Nanotechnology
[Image caption: Artistic impression of metamaterial structure consisting of gold nanorods illuminated by two interacting light beams. Courtesy of R. McCarron.] Notes to editors
The paper ‘Designed ultrafast optical nonlinearity in a plasmonic nanorod metamaterial enhanced by nonlocality’ is published on Nature Nanotechnology's website
For further information http://www.activeplasmonics.org/ King's College London
King's College London is one of the top 25 universities in the world (2010 QS international world rankings), The Sunday Times
'University of the Year 2010/11' and the fourth oldest in England. A research-led university based in the heart of London, King's has nearly 23,000 students (of whom more than 8,600 are graduate students) from nearly 140 countries, and some 5,500 employees. King's is in the second phase of a £1 billion redevelopment programme which is transforming its estate.
King's has an outstanding reputation for providing world-class teaching and cutting-edge research. In the 2008 Research Assessment Exercise for British universities, 23 departments were ranked in the top quartile of British universities; over half of our academic staff work in departments that are in the top 10 per cent in the UK in their field and can thus be classed as world leading. The College is in the top seven UK universities for research earnings and has an overall annual income of nearly £450 million.
King's has a particularly distinguished reputation in the humanities, law, the sciences (including a wide range of health areas such as psychiatry, medicine, nursing and dentistry) and social sciences including international affairs. It has played a major role in many of the advances that have shaped modern life, such as the discovery of the structure of DNA and research that led to the development of radio, television, mobile phones and radar. It is the largest centre for the education of healthcare professionals in Europe; no university has more Medical Research Council Centres.
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