All-optical polariton transistor

Details All-optical polariton transistor All-optical polariton transistor

2012-01-19

arxiv.org/abs/1201.4071v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

While optical technology provides the best solution for the transmission of information, optical logics is still in its infancy. In particular, energy considerations impose to reduce the power required for nonlinear interactions in future optical devices, which, in addition, should be compatible with present semiconductor technology. Exciton-polaritons are composite particles, resulting from the strong coupling between excitons and photons, which have recently demonstrated exceptional properties like huge non-linearities, condensation and superfluidity. Here we experimentally demonstrate a switching scheme for polaritons moving in the plane of a microcavity which satisfy all the requirements for an all-optical transistor. Two laser beams are converted into polariton quasi-particles, which are used as input states for generating and controlling the output, obtaining up to 19 times amplification. Moreover this polariton transistor shows to work with an interchangeable input-output signal, and needing an energy activation as low as few attojoules/\mum2.

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