{"id":8372,"date":"2013-07-14T23:59:00","date_gmt":"2013-07-14T23:59:00","guid":{"rendered":"http:\/\/198.74.50.173\/2013\/07\/graphene-can-enable-femtosecond.html"},"modified":"2017-04-07T04:12:30","modified_gmt":"2017-04-07T04:12:30","slug":"graphene-can-enable-femtosecond","status":"publish","type":"post","link":"https:\/\/www.nextbigfuture.com\/2013\/07\/graphene-can-enable-femtosecond.html","title":{"rendered":"Graphene can enable femtosecond switching and could lead to speeding up the internet by one hundred times"},"content":{"rendered":"

The use of graphene in telecommunications could dramatically accelerate internet speeds by up to a hundred times.<\/a><\/p>\n

Ordinarily optical switches respond at rate of a few picoseconds \u2013 around a trillionth of a second. Through this study physicists have observed the response rate of an optical switch using \u2018few layer graphene\u2019 to be around one hundred femtoseconds \u2013 nearly a hundred times quicker than current materials.<\/p>\n

Commenting on the report\u2019s main findings, lead researcher Dr Enrico Da Como said: \u201cWe\u2019ve seen an ultrafast optical response rate, using \u2018few-layer graphene\u2019, which has exciting applications for the development of high speed optoelectronic components based on graphene. This fast response is in the infrared part of the electromagnetic spectrum, where many applications in telecommunications, security and also medicine are currently developing and affecting our society.\u201d<\/p>\n

In the long term this research could also lead to the development of quantum cascade lasers based on graphene. Quantum cascade lasers are semiconductor lasers used in pollution monitoring, security and spectroscopy. Few-layer graphene could emerge as a unique platform for this interesting application.<\/p>\n

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Physical Review Letters – Carrier Lifetime in Exfoliated Few-Layer Graphene Determined from Intersubband Optical Transitions<\/a><\/p>

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We report a femtosecond transient spectroscopy study in the near to middle infrared range, 0.8\u20130.35 eV photon energy, on graphene and few layer graphene single flakes. The spectra show an evolving structure of photoinduced absorption bands superimposed on the bleaching caused by Pauli blocking of the interband optically coupled states. Supported by tight-binding model calculations, we assign the photoinduced absorption features to intersubband transitions as the number of layers is increased. Interestingly, the intersubband photoinduced resonances show a longer dynamics than the interband bleaching, because of their independence from the absolute energy of the carriers with respect to the Dirac point. The dynamic of these intersubband transitions reflects the lifetime of the hot carriers and provides an elegant method to access it in this important class of semimetals.<\/p>\n

\nIf you liked this article, please give it a quick review on ycombinator<\/a><\/b> or StumbleUpon<\/a><\/b>. Thanks<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"

The use of graphene in telecommunications could dramatically accelerate internet speeds by up to a hundred times. Ordinarily optical switches respond at rate of a few picoseconds \u2013 around a trillionth of a second. Through this study physicists have observed the response rate of an optical switch using \u2018few layer graphene\u2019 to be around one … <\/p>\n

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