Speaker
Mr
Urban Senica
(ETH Zurich)
Description
Terahertz quantum cascade lasers based on double metal waveguides are compact sources of terahertz radiation with excellent properties in terms of covering a large bandwidth and exhibiting low waveguide dispersion. However, as the optical mode is confined to subwavelength dimensions, the emitted radiation produces a highly divergent far-field pattern. We designed and fabricated an antipodal Vivaldi antenna which adiabatically expands the optical mode while rotating its polarization from vertical towards horizontal polarization. Numerical simulations predict a single-lobed far-field pattern with a beam width of less than 20°, spanning over two octaves in frequency (1.5-4.5 THz). Far-field measurements agree well with simulations.
Primary author
Mr
Urban Senica
(ETH Zurich)
Co-authors
Dr
Elena Mavrona
(ETH Zurich)
Mr
Tudor Olariu
(ETH Zurich)
Mr
Andres Forrer
(ETH Zurich)
Dr
Mattias Beck
(ETH Zurich)
Prof.
Jérôme Faist
(ETH Zurich)
Dr
Giacomo Scalari
(ETH Zurich)
