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Researchers at the University of Illinois at Urbana-Champaign have successfully recorded optically encoded audio onto a plasmonic nanostructure that is non-magnetic. This is considered to be the first ever recording of such an audio. This type of recording could be used for archival storage and informational processing.

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Toussaint’s group had earlier discovered pillar-supported bowtie nanoantennas (pBNAs) made of gold. An array of gold pBNAs exhibits a specific photographic film property that was utilized for storage of audio and sound files. pBNAs demonstrate a storage capacity that is approximately 5,600 times larger than typical magnetic film that is used for analog data storage. These pBNAs hold promise for a wide array of storage applications.

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The research team showed that sound information could be stored by pBNAs in two forms – as a frequency varying intensity waveform or as a temporally varying intensity waveform. They stored the basic eight musical notes along with the middle C, D, and E on a pBNA chip. The team then retrieved these notes and played them in specific order so that a tune was created.

Source: http://www.nature.com/srep/2015/150316/srep09125/full/srep09125.html

http://www.nature.com/srep/2015/150316/srep09125/pdf/srep09125.pdf

 

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