Article

Journal of Infrared, Millimeter, and Terahertz Waves

, Volume 33, Issue 3, pp 319-326

Flexible, Low-loss Waveguide Designs for Efficient Coupling to Quantum Cascade Lasers in the Far-infrared

  • Ugo Siciliani de CumisAffiliated withNEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
  • , Ji-Hua XuAffiliated withNEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
  • , Carlos M. BledtAffiliated withDepartment of Materials Science and Engineering, Rutgers University
  • , James A. HarringtonAffiliated withDepartment of Materials Science and Engineering, Rutgers University
  • , Alessandro TredicucciAffiliated withNEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore
  • , Miriam S. VitielloAffiliated withNEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore Email author 

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Abstract

We coupled linearly polarized and azimuthally polarized Terahertz quantum cascade lasers (QCLs) to the low-loss optical modes of hollow core waveguides having a sequence of different metallic or dielectric inner coatings. The latter waveguides have been specifically designed to force the propagation of a dominant optical mode once the thickness (d) of the inner dielectric coating is properly chosen. Our results demonstrate that both the TE01 and the TE11 modes can be easily converted to a hybrid one when d > 6 μm allowing the propagation of THz QCL beams with transmission losses as low as 1.5 dB/m, bending losses < 1.1 dB and reasonably high coupling efficiencies (87%).

Keywords

Waveguides Quantum cascade lasers Terahertz