论文标题
来自强烈吸收培养基
Compact photonic-crystal superabsorbers from strongly absorbing media
论文作者
论文摘要
我们提出了一种在紧凑的光子晶体（PC）结构中近乎完美吸收的途径，该结构是由强烈吸收的培养基构建的，这些培养基通常以散装形式高度反射。我们的分析表明，这种PC超级陶器中的关键基础机制是存在无PC带反射条件。尽管后者在光子晶体中默认情况下是不典型的，但我们在这里提出了一个清晰的食谱，以通过调整一维有损PC结构的结构特征如何满足这种情况。基于此食谱，我们构建了一个可实现的三层SIC-BAF2-SIC PC，在SIC的RESTSTRAHLEN频带中运行。我们在该原型中表现出了几乎完美的吸收，该原型的总厚度小于LAMDA/3，其中，超过90％的撞击光被顶部厚度厚度的深层波长〜lamda/1100吸收。我们认为，我们的研究将激发新的基于光子晶状体的设计，用于在电磁频谱中实现极端吸收。
We present a route to near-perfect absorption in compact photonic-crystal (PC) structures constructed from strongly absorbing media that are typically highly reflective in bulk form. Our analysis suggests that the key underlying mechanism in such PC superabsorbers is the existence of a PC-band-edge reflectionless condition. Although the latter is by default uncharacteristic in photonic crystals, we propose here a clear recipe on how such condition can be met by tuning the structural characteristics of one-dimensional lossy PC structures. Based on this recipe we constructed a realizable three-layer SiC-BaF2-SiC PC operating within the Reststrahlen band of SiC. We demonstrate near-perfect absorption in this prototype of total thickness smaller than lamda/3, where more than 90% of the impinging light is absorbed by the top deep-subwavelength layer of thickness ~lamda/1100. We believe our study will inspire new photonic-crystal-based designs for extreme absorption harnessing across the electromagnetic spectrum.
