Imaging of Large-Area Graphene using Terahertz Cross-Correlation Spectroscopy

A novel THz Cross-Correlation system is presented and used for spectroscopy on few-layer graphene in the 0.1-1.4 THz range. The system utilizes photomixing of a telecom wavelength amplified spontaneous emission light source in a photoconductive antenna for THz generation and coherent cross-correlation sampling in a photoconductive antenna for detection. In addition to extracting the electrical properties of graphene using a spectroscopic model, we propose to extract the electrical properties by correlation to the time-domain peak-to-peak values of the obtained THz pulses, allowing for extraction at much higher rates.