Terahertz graphene optics
Single-layer graphene, terahertz, conductance, multilayer graphene, broadband
ABSTRACT The magnitude of the optical sheet conductance of single-layer graphene is universal, and equal to e2/4ħ (where 2πħ = h (the Planck constant)). As the optical frequency decreases, the conductivity decreases. However, at some frequency in the THz range, the conductivity increases again, eventually reaching the DC value, where the magnitude of the DC sheet conductance generally displays a sample- and doping-dependent value between ~e2/h and 100 e2/h. Thus, the THz range is predicted to be a non-trivial region of the spectrum for electron transport in graphene, and may have interesting technological applications. In this paper, we present the first frequency domain measurements of the absolute value of multilayer graphene (MLG) and single-layer graphene (SLG) sheet conductivity and transparency from DC to 1 THz, and establish a firm foundation for future THz applications of graphene.
Tsinghua University Press
Nima Rouhi,Santiago Capdevila,Dheeraj Jain,Katayoun Zand,Yung Yu Wang,Elliott Brown,Lluis Jofre,Peter Burke, Terahertz graphene optics. NanoRes.2012, 5(10): 667–678