Article

Journal of Infrared, Millimeter, and Terahertz Waves

, Volume 34, Issue 11, pp 724-739

Review of Anisotropic Terahertz Material Response

  • Takashi ArikawaAffiliated withDepartment of Electrical & Computer Engineering, Rice UniversityDepartment of Physics, Kyoto University
  • , Qi ZhangAffiliated withDepartment of Electrical & Computer Engineering, Rice University
  • , Lei RenAffiliated withDepartment of Electrical & Computer Engineering, Rice University
  • , Alexey A. BelyaninAffiliated withDepartment of Physics, Texas A&M University
  • , Junichiro KonoAffiliated withDepartment of Electrical & Computer Engineering, Rice University Email author 

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Abstract

Anisotropy is ubiquitous in solids and enhanced in low-dimensional materials. In response to an electromagnetic wave, anisotropic absorptive and refractive properties result in dichroic and birefringent optical phenomena both in the linear and nonlinear optics regimes. Such material properties have led to a diverse array of useful polarization components in the visible and near-infrared, but mature technology is non-existent in the terahertz (THz). Here, we review several novel types of anisotropic material responses observed in the THz frequency range, including both linear and circular anisotropy, which have long-term implications for the development of THz polarization optics. We start with the extreme linear anisotropy of macroscopically aligned carbon nanotubes, arising from their intrinsically anisotropic dynamic conductivity. Magnetically induced anisotropy will then be reviewed, including the giant Faraday effects observed in semiconductors, semimetals, and two-dimensional electron systems.

Keywords

Anisotropy Terahertz Nanotube Faraday effect Cyclotron resonance