Abstract
In this work, a three-dimensional periodic ordered microrod porous structure is used to model the SiC magneto-optical porous medium. The nonreciprocal optical properties of the monolayer and multilayer porous structures are studied in the infrared band. The effects of the structure parameters, such as round rib height, rib diameter and layer number, are predicted by applying the FDTD method to analyze the nonreciprocal absorptance. And the characteristics of absorption spectra based on the optimized porous structure by adding air columns into the microrods are further studied. The nonreciprocal absorptance of these two porous structures was compared at different incident angles and different magnetic field intensities, and it was discovered that the smaller angle of incidence, the stronger nonreciprocal effect. Moreover, the enhanced nonreciprocal absorptance of these two porous structures is described as the contour plot of the electrical field intensities, in which the physical mechanism is also explained. It is found that the addition of air columns can effectively increase the absorptive capacity of the structure and enhance the nonreciprocal absorption in the infrared wavelength range.
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