Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

An aerial for light

17.02.2003


Austrian physicists report unusual light-metal interaction



A team under Professor Franz Aussenegg at the University of Graz in Austria is looking into unusual interactions between light and submicroscopic metal particles. The physicists’ findings represent a major advance towards the development of improved data storage media and optical sensors. They also confirmed theoretical predictions and merited publication in 13 international scientific journals. These are the impressive results of a two-year project funded by the Austrian Science Fund (FWF) that has been investigating the nano-cosmos.

“There’s plenty of room at the bottom,” said American Nobel Prizewinner Richard P. Feynman back in 1959. By “the bottom” he meant the world of things that are too small to see, and his point is proved by today’s computer chips, which are constantly becoming smaller yet can process increasing amounts of data, and the steadily growing capacity of CDs and DVDs. However data processing in ever tinier dimensions calls for new technologies. One of these, nano-optics, which uses light, is being researched into by Prof. Aussenegg’s team at the University of Graz Institute for Experimental Physics in Austria.


“For physical reasons guiding light with the help of lenses, mirrors or prisms is no longer possible when you get down to millionths of millimetres — the nanoworld,” said the Institute’s director, Aussenegg. “But this is the level where light — or to be more precise, optoelectrical fields — can be led through solid materials. In principle, it’s like guiding radio and TV signals through aerials and cables.” This is possible because light enters into a fascinating interaction with metal at the nanometre level. It is no longer reflected but instead excites electrons near the surface of the metal, causing them to oscillate. For a short time the light is “captured“ in the metallic structure, as an electrical field. If this “surface plasmon” state lasts long enough the optoelectrical oscillations in the metal can be channelled, as though they were travelling along a nanoscopic wire. This is crucial to the prospects of nano-optics as a practical technology.

The Graz project, completed in December 2002, succeeded in demonstrating that it is possible to influence the duration of the oscillating state of electrons near the surface of a grating-like structure of metal particles that are a few millionths of a millimetre apart from each other. The FWF backed project investigated the influence of the precise dimensions of gold and silver gratings. It provided convincing confirmation of the theoretical prediction that the right ratio of the spacing of the metal particles and their size to the wavelength of the light would quadruple the duration of the oscillation.

The team’s findings have laid the groundwork for the use of light as an alternative to electrotechnology in telecommunications engineering, data processing and data storage. The results have already opened the way for improved data storage media and optical sensors. The researchers’ work has attracted widespread attention, as shown by an article published on 24 October in the online version of Britain’s Economist magazine which spoke of a “significant step towards properly integrated optoelectronics”. Again and again, the origins of industrial revolutions have lain in fundamental research, and the breakthrough in Graz could be the start of another.

Bildunterschrift: The principle of the surface plasmon: light spreads outwards on a nanoscopic metal surface similarly to a wave in water.

Alexandra Stolba | alfa

More articles from Physics and Astronomy:

nachricht Hubble sees Neptune's mysterious shrinking storm
16.02.2018 | NASA/Goddard Space Flight Center

nachricht Supermassive black hole model predicts characteristic light signals at cusp of collision
15.02.2018 | Rochester Institute of Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>