We theoretically demonstrate an approach for designing absorbers with strongly intensity-dependent absorption. The proposed absorbers consist of a spacer layer between a top resistive sheet and an underlying metallic substrate, akin to the traditional Salisbury screen, except for the use of an epsilon-near-zero slab with a nonlinear dielectric inclusion as the spacer layer. Such absorbers may be designed to exhibit highly tailorable absorption characteristics, including either saturable or reverse saturable absorption. In addition, the proposed nonlinear absorbers include interesting features such as high angular selectivity, insensitivity with respect to the absorber thickness, bandwidth tunability, and the possibility of operating with or without hysteresis. The proposed nonlinear absorbers may be appealing for several applications and nonlinear devices, such as optical limiters.

中文翻译：

---

通过ε-近零元结构的光子掺杂实现的非线性超材料吸收体

我们从理论上证明了一种设计具有强烈强度依赖性吸收的吸收体的方法。拟议的吸收器由顶部电阻片和下面的金属基板之间的隔离层组成，类似于传统的Salisbury屏幕，除了使用具有非线性介电夹杂物的ε-接近零平板作为隔离层。可以将这种吸收剂设计成表现出高度可调节的吸收特性，包括可饱和或反饱和吸收。另外，所提出的非线性吸收器包括有趣的特征，例如高角度选择性，相对于吸收器厚度的不敏感性，带宽可调性以及在有或没有滞后的情况下工作的可能性。