Direct and Heterodyne Detection of Microwaves in a Metallic Single Wall Carbon Nanotube

Details Direct and Heterodyne Detection of Microwaves in a Metallic Single Wall Carbon Nanotube Direct and Heterodyne Detection of Microwaves in a Metallic Single Wall Carbon Nanotube

2006-04-21

arxiv.org/abs/cond-mat/0604520v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.2337863

This letter reports measurements of microwave (up to 4.5 GHz) detection in metallic single-walled carbon nanotubes. The measured voltage responsivity was found to be 114 V/W at 77K. We also demonstrated heterodyne detection at 1 GHz. The detection mechanism can be explained based on standard microwave detector theory and the nonlinearity of the DC IV-curve. We discuss the possible causes of this nonlinearity. While the frequency response is limited by circuit parasitics in this measurement, we discuss evidence that indicates that the effect is much faster and that applications of carbon nanotubes as terahertz detectors are feasible.

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