Refractory materials have wide applications due to their high thermal and chemical stability. In this work, we numerically design the plasmonic structure for perfect light absorption using the resonant behaviours for these materials. The results of the simulation are presented using the three-dimensional finite-difference time-domain method. The maximum absorption reaches 99.9% and the near-unity absorption window spans a bandwidth of 1182 nm from 413 nm in the visible to 1595 nm in the near-infrared range. Strong plasmonic near-field coupling between the adjacent parts in the split circular Ti resonator and their coupling to the plasmon resonances of the TiN layer are the main reasons for the ultra-broadband perfect absorption. Moreover, the absorption is observed to be incident angle insensitive and polarization independent. Absorption properties can be manipulated via tuning the structural parameters. These impressive absorption features and the high thermal stability can hav...

中文翻译：

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基于难熔Ti / TiN谐振器的亚表面，可实现完美的光吸收

耐火材料由于其高的热稳定性和化学稳定性而具有广泛的用途。在这项工作中，我们利用这些材料的共振行为，对等离子体结构进行了数值设计，以实现完美的光吸收。仿真结果使用三维有限差分时域方法给出。最大吸收率达到99.9％，近统一吸收窗口的带宽从可见光的413 nm到近红外的1595 nm跨越1182 nm。分开的圆形Ti谐振器中相邻部分之间的强等离子体近场耦合以及它们与TiN层的等离子体激元谐振的耦合是超宽带完美吸收的主要原因。此外，观察到吸收对入射角不敏感且与偏振无关。吸收性能可以通过调整结构参数来控制。这些令人印象深刻的吸收特性和高的热稳定性可以使...