Miniaturization of dielectric ceramic-based metamaterial perfect absorber

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.

Automated summary

Currently, the miniaturization requirements of microwave or terahertz perfect absorbers using dielectric ceramic-based metamaterials cannot be met due to the low dielectric constant. In this study, we introduced conductivity loss through the carburizing process in order to improve the absorbers, and demonstrated the mechanism using electromagnetic simulation. By establishing a carburizing channel in Ba4Sm9.33Ti18O54 ceramics with an appropriate dielectric constant, the microwave absorbance was doubled and the period was reduced by half compared to pure ceramic-based absorbers. This approach can be extended to various metamaterials using dielectric resonance, offering an effective strategy for device miniaturization and potentially breaking the restrictive relationship between device size and dielectric constant.