Miniaturization of dielectric ceramic-based metamaterial perfect absorber

Abstract

Currently, due to the low resonance absorption of each dielectric ceramic block with a finite dielectric constant, the period of dielectric ceramic-based metamaterials for microwave or terahertz perfect absorbers is always large, which cannot meet the miniaturization requirements. Here, we introduce another absorption loss dimension, conductivity loss, by nano-carbon powders through the carburizing process to ameliorate these metamaterial absorbers; the mechanism based on electromagnetic simulation is also sufficiently demonstrated. Then, we establish a carburizing channel in the Ba4Sm9.33Ti18O54 ceramics with an appropriate dielectric constant (<80) for verification, and the microwave absorbance can be double improved. Correspondingly, the period is only 1/2 that of the pure ceramic-based one. Furthermore, this approach is considered to be extended into various metamaterials using dielectric resonance, proposing an effective strategy for device miniaturization, and the restrictive relationship between device size and dielectric constant is expected to be broken.