Open AccessTerahertz optical bistability of graphene in thin layers of dielectrics
Author(s) -
Kwang Jun Ahn,
Fabıan Rotermund
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.008484
Subject(s) - graphene , terahertz radiation , materials science , optical bistability , bistability , dielectric , optics , thin film , optoelectronics , optical conductivity , conductivity , hysteresis , fermi energy , condensed matter physics , nonlinear optics , nanotechnology , laser , physics , quantum mechanics , electron
We theoretically studied in terahertz frequency regime optical bistability of graphene placed at the interface between thin dielectric layers. We solved self-consistently the nonlinear wave equations containing the third-order optical conductivity of graphene in four-layer structures and obtained hysteresis response of the transmitted power as a function of the incident power. We numerically observed that the critical powers for the up and down transitions and the Fermi-energy of graphene required for terahertz optical bistability can be reduced by carefully choosing material properties and the thicknesses of dielectric layers. Furthermore, these values can be substantially decreased when graphene as a randomly stacked multilayer structure is asymmetrically located in thin dielectric layers.