“…Nevertheless, in certain designs based on the effect of plasmon-induced enhanced optical transmision (EOT) realized using metallic films with slits or holes, which combine strong field localization with enhanced transmission, the excitation of plasmon modes that give rise to EOT may lead to high transmission and, at the same time, large polarization rotation [23,[26][27][28][29][30][31]. Alternatively, significant enhancement can be achieved by incorporating the MO film between two Bragg multilayer mirrors [35][36][37][38][39] or between two metallic layers [40,41], so as to form a Fabry-Pérot (FP) resonant cavity that confines the EM energy inside the active MO material through multiple reflections at the surfaces. Moreover, simple one-dimensional (1D) designs, including epsilon-near-zero metamaterials consisting of deeply subwavelength metal/MO dielectric multilayers, have also been considered as isolators for circularly polarized light [42].…”