Gyrotropic hexaferrite materials are believed to be very promising candidates for operation in non-reciprocal devices at terahertz frequencies. We present full permittivity and permeability tensor characterization of different hexaferrite crystalline and ceramic samples in a wide band (0.075–5 THz) using both an original magneto-optical Time-Domain-Spectrometry setup and a magneto-quasi-optical setup using Vector-Network-Analyzer-controlled frequency multipliers. The obtained gyrotropic THz spectra allow validation of a novel concept for a compact THz isolator based on a one-way reflecting surface, that will also be presented.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.