Collective Antenna Effects in the Terahertz and Infrared Response of Highly Aligned Carbon Nanotube Arrays

Abstract

We study macroscopically-aligned single-wall carbon nanotube arrays with uniform lengths via polarization-dependent terahertz and infrared transmission spectroscopy. Polarization anisotropy is extreme at frequencies less than $\sim$3 THz with no sign of attenuation when the polarization is perpendicular to the alignment direction. The attenuation for both parallel and perpendicular polarizations increases with increasing frequency, exhibiting a pronounced and broad peak around 10 THz in the parallel case. We model the electromagnetic response of the sample by taking into account both radiative scattering and absorption losses. We show that our sample acts as an effective antenna due to the high degree of alignment, exhibiting much larger radiative scattering than absorption in the mid/far-infrared range. Our calculated attenuation spectrum clearly shows a non-Drude peak at $\sim$10 THz in agreement with the experiment.

arXiv comment5 pages, 5 figures

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• Interband transitions in narrow-gap carbon nanotubes and graphene nanoribbons
• Review of Anisotropic Terahertz Material Response
• Two-dimensional plasmons in lateral carbon nanotube network structures and their effect on the terahertz radiation detection
• Broadband laser polarization control with aligned carbon nanotubes
• Giant Terahertz Polarization Rotation in Ultrathin Films of Aligned Carbon Nanotubes
• Polarization-sensitive terahertz time-domain spectroscopy system without mechanical moving parts
• Momentum alignment and the optical valley Hall effect in low-dimensional Dirac materials
• Midinfrared Third Harmonic Generation from Macroscopically Aligned Ultralong Single-Wall Carbon Nanotubes
• Soliton nanoantennas in two-dimensional arrays of quantum dots