Concentrating optical energy to areas much smaller than the diffraction limit, with high field enhancement in mid-infrared (MIR) using noble metals such as gold (Au) or silver (Ag), is not feasible because of high losses, lack of tunability, low resolution, and low-intensity enhancement. Our methods are based on appropriate metamaterial selection, coupling system (a hyperbolic metalens and a nanoantenna), and optimizations of their geometries. Doped indium arsenide (InAs) is used as an alternative to plasmonic metals when designing a Fresnel zone plate (FZP). A hyperbolic metamaterial (HMM), placed under FZP, is formed by stacking layers of doped and undoped InAs. By combining the focal spot of the metalens with the excited plasmons of a nanoantenna, the resulting structure exhibits an ultrahigh field-intensity enhancement factor of about 10¹² with a high absorption cross-section and a focusing resolution of up to 10⁻³ λ at the operating wavelength of 7.8 μm.

由于损耗高，缺乏可调谐性，使用金（Au）或银（Ag）等贵金属在中红外（MIR）中进行高场增强时，将光能集中到远小于衍射极限的区域是不可行的。低分辨率和低强度增强。我们的方法基于适当的超材料选择，耦合系统（双曲线金属和纳米天线）及其几何形状的优化。在设计菲涅耳波带片（FZP）时，使用掺杂的砷化铟（InAs）替代等离子体金属。通过堆叠掺杂和未掺杂的InAs层形成置于FZP下的双曲线超材料（HMM）。通过将金属离子的焦点与纳米天线的激发等离子体激元结合，所得结构显示出约10的超高场强增强因子¹²具有高吸收截面和高达10的聚焦分辨率^-3 λ在7.8μ工作波长米。