Second harmonic generation in multilayer graphene induced by direct electric current

Details Second harmonic generation in multilayer graphene induced by direct electric current Second harmonic generation in multilayer graphene induced by direct electric current

2012-03-20

arxiv.org/abs/1203.4395v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Optical second harmonic generation (SHG) is studied from multilayer graphene films in the presence of DC electric current flowing in the sample plane. Graphene layers are manufactured by chemical vapour deposition (CVD) technique and deposited on an oxidised Si(001) substrate. SHG intensity from graphene layer is found to be negligible in the absence of the DC current, while it increases dramatically with the application of the electric current. The current-induced change of the SHG intensity rises linearly with the current amplitude and changes its sign under the reversal of the current direction to the opposite. The observed effect is explained in terms of the interference of second harmonic radiation reflected from the Si surface and that induced by the DC current in multilayer graphene.

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