Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combsUrban Senica, Andres Forrer, Tudor Olariu, Paolo Micheletti, Sara Cibella, Guido Torrioli, Mattias Beck, Jérôme Faist and Giacomo ScalariEPJ Web Conf., 266 (2022) 09007DOI: https://doi.org/10.1051/epjconf/202226609007