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New Results on Terahertz Detection by Carbon Nanotubes

Since our first report on terahertz detection by bundles of single wall carbon nanotubes (SWCNTs) at the ISSTT2008, we have fabricated a large number of additional antenna-coupled SWCNT devices that all show terahertz detection. The maximum voltage responsivity (S V) is about 25 V/W (intrinsic value 50 V/W) at 4.2 K, and SV decreases slowly with temperature up to about 100 K. In this paper we further explore different fabrication procedures and the bolometric detection process. We also demonstrate diode type detection at terahertz frequencies in SWCNTs for the first time. We present results of circuit simulations and ab initio simulations of the electronic properties of SWCNTs.