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      An antipodal Vivaldi antenna for improved far-field properties and polarization manipulation of broadband terahertz quantum cascade lasers

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          Abstract

          We present an antipodal Vivaldi antenna for broadband double metal waveguide terahertz quantum cascade lasers and frequency combs. Its exponentially curved flare profile results in an adiabatic in-plane mode expansion, producing an improved far-field with a single-lobed beam of (23{\deg}x19{\deg}) full width half maximum with an octave-spanning bandwidth. The antenna also acts as a wave retarder, rotating the polarization from vertical toward horizontal polarization by a frequency-dependent angle. The laser's emission spectrum and current-voltage characteristics are not affected, as well as frequency comb operation. Measurements agree well with numerical simulations, and the proposed antenna covers a broad spectral range (1.5-4.5 THz).

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          Author and article information

          Journal
          22 April 2020
          Article
          10.1063/5.0004038
          2004.10895
          563aa32f-fc79-487b-92bd-0e8fefb7ef12

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Appl. Phys. Lett. 116, 161105 (2020)
          physics.optics

          Optical materials & Optics
          Optical materials & Optics

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