Band‐ and Angle‐Selective Infrared Thermal Emission Enabled by Cascaded Berreman Modes and Impedance Matching

Thermal emitters that simultaneously regulate bands and angles are essential for infrared camouflage and radiative thermal management, yet suppressing atmospheric‐window signatures while preserving heat‐dissipation channels remains challenging in planar multilayer structures. Here, a Berreman–impedance‐coupled thermal emitter is demonstrated by integrating cascaded polar‐dielectric epsilon‐near‐zero layers with an impedance‐matched ZnS/Mo/ZnS/Mo lossy cavity. The ultrathin Mo layer concentrates ohmic dissipation and opens a broadband 5–8 µm non‐atmospheric‐window emission channel, whereas cascaded Berreman modes in Al 2 O 3 , SiO, and SiO 2 redirect long‐wave infrared emission toward high angles. Under normal incidence, the emitter shows low average emissivities of 0.22 in the 3–5 µm atmospheric window and 0.15 in the 8–12 µm atmospheric window. Under p‐polarization, the 8–12 µm emissivity increases strongly with angle, peaking at 0.98 and averaging ≈0.87 at 80°. Thermal imaging from 150°C to 400°C confirms stable angular emission, and hemispherical integration gives a radiative power density of 4860 W m − 2 at 400°C. This multilayer design provides a structurally simple route to band–angular thermal emission control for high‐temperature infrared camouflage and radiative heat management.