The optical properties of SnO$_{2}$ nano-wires by THz time-domain spectroscopy

As feature seizes of devices are reduced below a hundred nanometers and chip frequencies reaches high GHz, a convenient method of characterizing thin films in the GHz to THz frequency range has been required. THz time-domain spectroscopy provides a non-destructive, non-contact, and high-sensitive tool to characterize thin films as well as nano-materials. The optical properties of SnO$_{2}$ nano-wires, which were grown on z-cut quartz, have been investigated by THz time-domain spectroscopy. The real and imaginary parts of the complex refractive index and optical conductivity are measured at THz frequency.