Design, fabrication, and demonstration of a dielectric vortex waveguide in the sub-terahertz region Aflakian, Nafiseh ; LaFave, Tim P. ; Kenneth, K. O. ; Ashrafi, Solyman ; MacFarlane, Duncan L. Abstract Publication: Applied Optics Pub Date: August 2017 DOI: 10.1364/ao.56.007123 Bibcode: 2017ApOpt..56.7123A