A designer metamaterial has shown it can engineer emitted "blackbody" radiation with an efficiency beyond the natural limits imposed by the material's temperature, a team of researchers report in Physical Review Letters. Illustration shows design of the infrared metamaterial absorber. (a) Top view of a single band metamaterial absorber unit cell. (b) Schematic of a dual-band metamaterial absorber. (c & d) Perspective view for single and dual-band metamaterial absorbers.