Terahertz conductivity characterization of nanostructured graphene-like films for optoelectronic applications

Ehsan Dadrasnia; Horacio Lamela

doi:10.1117/1.JNP.9.093598

Abstract

Difficulty in deposition and integration of fragile graphene-like samples for optoelectronic devices may prevent a multiple contact measurement procedure. We employed noncontact and nondestructive transmission and reflection terahertz (THz)-pulsed spectroscopy to investigate not only the electrical conductivity, but also to study the optical properties of one-dimensional and two-dimensional graphene-like samples. The Drude and non-Drude models were applied to observe and compare the ultrafast carrier transport parameters and high mobility characteristic of such high conductance-nanostructured thin films without requirement for postprocess patterning. The diffusive coefficient and nanoscopic characteristic length from noncontact THz measurement enables us to predict the cut-off frequency of such devices in relevant optoelectronic applications in sub-THz and THz frequencies. The results show that the cut-off frequency of the devices increases with a reduction of the channel length.

Citation Download Citation

Ehsan Dadrasnia, Ehsan Dadrasnia, Horacio Lamela, Horacio Lamela, } "Terahertz conductivity characterization of nanostructured graphene-like films for optoelectronic applications," Journal of Nanophotonics 9(1), 093598 (19 January 2015). https://doi.org/10.1117/1.JNP.9.093598 . Submission:

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