Optical bistability and multistability via double dark resonance in graphene nanostructure
Hossein Asadpour Seyyed†, , Solookinejad G, Panahi M, Ahmadi Sangachin E
       

Plots of output filed versus input field for different values of detuning of RHC and LHC fields. (a) and (b) . The other parameters are same as those in Fig. 2.