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Open Access Publications from the University of California

Active terahertz quantum-cascade composite right/left-handed metamaterial

  • Author(s): Tavallaee, AA
  • Hon, PWC
  • Chen, QS
  • Itoh, T
  • Williams, BS
  • et al.

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We report the demonstration of a composite right/left-handed (CRLH) metamaterial waveguide for terahertz quantum-cascade (QC) lasers. By incorporating gap capacitors (∼ 250 nm) in the top metallization of a metal-metal waveguide operating in a higher order lateral mode, we have realized a CRLH transmission line that supports traveling modes with negative effective phase indices (i.e., left-handed or backward-wave propagation). The CRLH metamaterial waveguide is employed as an active leaky-wave antenna for a terahertz QC-laser. Directional single-lobed beams launched in the backwards direction at angles of - 4 ° and - 63 ° were experimentally observed at excitation frequencies 2.59 and 2.48 THz, respectively. © 2013 American Institute of Physics.

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