Article Title

Terahertz graphene optics

Authors

Nima Rouhi, Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA
Santiago Capdevila, Universitat Politècnica de Catalunya, Barcelona, Spain
Dheeraj Jain, Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA
Katayoun Zand, Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA
Yung Yu Wang, Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA
Elliott Brown, Wright State University, Dayton, OH 45435, USA
Lluis Jofre, Universitat Politècnica de Catalunya, Barcelona, Spain
Peter Burke, Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA

Keywords

Single-layer graphene, terahertz, conductance, multilayer graphene, broadband

Abstract

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.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-012-0251-0

Publisher

Tsinghua University Press

Recommended Citation

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