Beam Waist Properties of Spiral Antenna Coupled HEB Mixers at Supra-THz Frequencies Gaspar Silva, José Rui ; Finkel, Matvey ; Laauwen, Wouter M. ; Yates, Stephen J. C. ; Mirzaei, Behnam ; Vercruyssen, Nathan ; Young, Abram ; Kulesa, Craig ; Walker, Christopher ; van der Tak, Floris ; Gao, Jian Rong Abstract Publication: IEEE Transactions on Terahertz Science and Technology Pub Date: March 2023 DOI: 10.1109/TTHZ.2022.3230742 Bibcode: 2023ITTST..13..167G