Thursday, June 22, 2017

Abstract-Numerical Study of Plasmonic Resonance Enhanced, Terahertz Second Harmonic Generation from Graphene in the Otto Configuration

Hadiseh Nasari,  Mohammad Sadegh Abrishamian

Impact Statement:
In this contribution for the first time to the best of our knowledge, the enhancement of terahertz (THz) second harmonic generation (SHG) from graphene in the Otto configuration via plasmonic excitations is reported by finite-difference time-domain (FDTD) technique which could be of interest from some points of views:The very strong nonlinear response of graphene in the terahertz frequency range which can reduce the power consumption.The tunability of graphene conductivity which provide the possibility of sustaining the resonance and so plasmonic enhancement condition upon variation of the frequency of incident wave. The use of graphene with atomic thickness and planar nature which makes it suitable for integration purposes.The employment of an easy to implement structure and plasmon excitation mechanism.Reporting full wave simulation results, unlike most of the published works which have only theoretically predicted and investigated the SHG in graphene.
We report on the plasmonic resonance-enhanced terahertz (THz) second-harmonic generation (SHG) from graphene via the technique of attenuated total reflection in the Otto configuration. Through our finite-difference time-domain numerical simulations, we reveal how greatly different parameters, including the radiation incidence angle, the graphene Fermi level, and the thickness and permittivity of the layer between the graphene and the prism, may affect the resonance condition, and so the intensity of generated second harmonic. Interestingly, we show how the great potential of graphene in the tunability of its Fermi energy provides the opportunity to preserve the plasmonic resonance condition and achieve the enhanced SHG upon variation of the fundamental-wave frequency without any need to employ the well-known approach of angular tuning of the illumination and detection facilities.

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