Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
Optics
2016-06-01 v1
Abstract
We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam direction independently. The spatial refractive index modulation of the gratings necessary to provide optical feedback at a fixed frequency and, simultaneously, a far-field emission pattern centered at controlled angles, was designed through use of an appropriate wavevector scattering model. Single mode THz emission at angles tuned by design between 0{\deg} and 50{\deg} was realized, leading to an original phase-matching approach, lithographically independent, for highly collimated THz QCLs.
Cite
@article{arxiv.1605.09416,
title = {Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings},
author = {F. Castellano and S. Zanotto and L. H. Li and A. Pitanti and A. Tredicucci and E. H. Linfield and A. G. Davies and M. S. Vitiello},
journal= {arXiv preprint arXiv:1605.09416},
year = {2016}
}