- Two-dimensional plasmons in lateral carbon nanotube network structures and their effect on the terahertz radiation detection doi link

Auteur(s): Ryzhii V., Otsuji T., Ryzhii M., Leiman V. g., Fedorov G., Goltzman G. n., Gayduchenko I. a., Titova N., Coquillat D., But D., Knap W., MITIN V., Shur M. S.

(Article) Publié: Journal Of Applied Physics, vol. 120 p.044501 (2016)
Texte intégral en Openaccess : arxiv

Ref HAL: hal-01375368_v1
DOI: 10.1063/1.4959215
WoS: WOS:000382405400030
Exporter : BibTex | endNote
11 Citations

We consider the carrier transport and plasmonic phenomena in the lateral carbon nanotube (CNT) networks forming the device channel with asymmetric electrodes. One electrode is the Ohmic contact to the CNT network and the other contact is the Schottky contact. These structures can serve as detectors of the terahertz (THz) radiation. We develop the device model for collective response of the lateral CNT networks which comprise a mixture of randomly oriented semiconductor CNTs (s-CNTs) and quasi-metal CNTs (m-CNTs). The proposed model includes the concept of the collective two-dimensional (2D) plasmons in relatively dense networks of randomly oriented CNTs (CNT “felt”) and predicts the detector responsivity spectral characteristics exhibiting sharp resonant peaks at the signal frequencies corresponding to the 2D plasmonic resonances. The detection mechanism is the rectification of the ac current due the nonlinearity of the Schottky contact current-voltage characteristics under the conditions of a strong enhancement of the potential drop at this contact associated with the plasmon excitation. The detector responsivity depends on the fractions of the s- and m-CNTs. The burning of the near-contact regions of the m-CNTs or destruction of these CNTs leads to a marked increase in the responsivity in agreement with our experimental data. The resonant THz detectors with sufficiently dense lateral CNT networks can compete and surpass other THz detectors using plasmonic effects at room temperatures.