Traditionally, light-matter interactions in the visible spectral range utilize tailored plasmonic nanostructure in metals that often require advanced nanofabrication techniques. Concomitantly, polar lattice vibrations in dielectrics are used to achieve mid-to-long wavelength infrared (IR) light-matter coupling. Achieving optical resonances simultaneously in the visible and mid-to-long wavelength IR spectral range in one host medium has been challenging due to mutually conflicting material and optical property requirements. In this article, we show simultaneous light-matter coupling and development of super absorbers in the visible and mid-IR spectral ranges with a lithography-free planar wide-angle metal-(polar)-dielectric-metal (MDM) Fabry-Pérot cavity composed of ultrathin refractory metallic TiN as the top layer and polar dielectric Al_0.72Sc_0.28N as the spacer layer. Lattice-matched TiN/Al_0.72Sc_0.28N/TiN MDM cavities exhibit super absorption resonance with maximum absorptivity of ∼99%. The absorption maxima spectral position is tuned with changes in spacer layer thickness and by utilizing multiple cavity interactions. Al_0.72Sc_0.28N inside the MDM is also used for light coupling to the transverse optical phonon mode and to the Berremann mode near the longitudinal phonon frequency with strong selective absorption. Demonstration of refractory epitaxial TiN/Al_0.72Sc_0.28N/TiN MDM metamaterials mark significant progress towards developing compact optical meta-structures with on-demand optical resonances at different spectral ranges.

传统上，可见光谱范围内的光物质相互作用利用金属中定制的等离子体纳米结构，这通常需要先进的纳米加工技术。同时，电介质中的极性晶格振动用于实现中长波长红外 (IR) 光物质耦合。由于相互冲突的材料和光学特性要求，在一种主体介质中同时在可见光和中长波红外光谱范围内实现光学共振一直具有挑战性。在本文中，我们展示了在可见光和中红外光谱范围内的超吸收体的同时光物质耦合和发展，以及无光刻平面广角金属-（极性）-介电金属 (MDM) 法布里-珀罗腔由作为顶层的超薄难熔金属 TiN 和极性电介质 Al 组成_0.72 Sc _0.28 N 作为间隔层。晶格匹配的 TiN/Al _0.72 Sc _0.28 N/TiN MDM 腔体表现出超吸收共振，最大吸收率约为 99%。吸收最大值光谱位置随着间隔层厚度的变化和利用多腔相互作用而调整。MDM内部的Al _0.72 Sc _0.28 N也用于光耦合到横向光学声子模式和具有强选择性吸收的纵向声子频率附近的Berremann模式。耐火外延 TiN/Al _0.72 Sc _0.28演示N/TiN MDM 超材料标志着在开发具有不同光谱范围的按需光学共振的紧凑光学超结构方面取得了重大进展。