Dynamic Conductivity and Two-Dimensional Plasmons in Lateral CNT Networks

We study theoretically the carrier transport and the plasmonic phenomena in the gated structures with dense lateral carbon nanotube (CNT) networks (CNT “felt”) placed between the highly-conducting slot line electrodes. The CNT networks under consideration consist of a mixture of semiconducting and metallic CNTs. We find the dispersion relations for the two-dimensional plasmons, associated with the collective self-consisted motion of electrons in the individual CNTs, propagating along the electrodes as functions of the net electron density (gate voltage), relative fraction of the semiconducting and metallic CNTs, and the spacing between the electrodes. In a wide range of parameters, the characteristic plasmonic frequencies can fall in the terahertz (THz) range. The structures with lateral CNT networks can used in different THz devices.

[1]  W. Knap,et al.  Two-dimensional plasmons in lateral carbon nanotube network structures and their effect on the terahertz radiation detection , 2016, 1602.05306.

[2]  Boris M. Voronov,et al.  Response of asymmetric carbon nanotube network devices to sub-terahertz and terahertz radiation , 2015 .

[3]  H. Bechtel,et al.  Observation of a Luttinger-liquid plasmon in metallic single-walled carbon nanotubes , 2015, Nature Photonics.

[4]  Qi Zhang,et al.  Carbon-based terahertz devices , 2015, Defense + Security Symposium.

[5]  F. Léonard,et al.  Uncooled Carbon Nanotube Photodetectors , 2015, 1505.02702.

[6]  R. Hauge,et al.  Carbon nanotube terahertz detector. , 2014, Nano letters.

[7]  J. Kono,et al.  Plasmonic nature of the terahertz conductivity peak in single-wall carbon nanotubes. , 2013, Nano letters.

[8]  T. M. Klapwijk,et al.  Photothermoelectric response in asymmetric carbon nanotube devices exposed to sub-terahertz radiation , 2013 .

[9]  D. Santavicca,et al.  Terahertz detection mechanism and contact capacitance of individual metallic single-walled carbon nanotubes , 2012, 1203.6290.

[10]  C. Thomsen,et al.  Terahertz conductivity peak in composite materials containing carbon nanotubes: Theory and interpretation of experiment , 2010 .

[11]  T. Ando,et al.  Optical Response of Finite-Length Carbon Nanotubes , 2009, 0909.1908.

[12]  M. Shur,et al.  One dimensional plasmons in pyroelectric-semiconductor composites , 2008 .

[13]  V. Ryzhii,et al.  Plasma waves in two-dimensional electron-hole system in gated graphene heterostructures , 2007 .

[14]  Akhlesh Lakhtakia,et al.  Theory of optical scattering by achiral carbon nanotubes and their potential as optical nanoantennas , 2006 .

[15]  Harry E. Ruda,et al.  Polarization-sensitive optical phenomena in semiconducting and metallic nanowires , 2005 .

[16]  Erich Schlecht,et al.  Carbon nanotube Schottky diodes using Ti-Schottky and Pt-Ohmic contacts for high frequency applications. , 2005, Nano letters.

[17]  Michael S. Shur,et al.  Plasma wave electronics: novel terahertz devices using two dimensional electron fluid , 1996 .

[18]  Shur,et al.  Shallow water analogy for a ballistic field effect transistor: New mechanism of plasma wave generation by dc current. , 1993, Physical review letters.

[19]  S. Luryi.  Quantum capacitance devices , 1988 .