HTTP:: Optical Gold Nanoantennas Now Possible
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Radio signals have been the standard for data transmission for well over a century, and innovations in the field have meant that higher and higher frequencies have been used to get as much data across as possible. Some time ago, scientists found out that wavelengths belonging to visible light could also be used for high-speed data transfer, and then research was underway to make such a means of communication possible. However, designing the small antennas needed for such forms of data transmission proved to be extremely expensive and difficult to accomplish. Now, experts at the KIT Light Technology Institute (LTI) managed to devise a method that could see them produced cheaply. For radio transmissions, a dipole antenna on the sending and receiving sides is all that it takes to transmit data from point A to point B. The best reception is ensured when the length of the antenna is about half the wavelength of the electromagnetic wave that it's supposed to detect. In more rece!
nt times, radio signals have been made to operate at very high frequencies, so the length of the antenna had to get considerably shorter. Currently, plans are to move to the 500,000-GHz range, which is equivalent to about 350 nanometers, in yellow light wavelengths. Creating optical transmission antennas at the nanoscale is tremendously diffi...
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http://news.softpedia.com/news/Optical-Gold-Nanoantennas-Now-Possible-124904.shtml
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