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An ultrabroad absorber based on double-ring-shaped titanium nitride (TiN)nanoresonators, which can work in high temperatures, is proposed andnumerically studied. The absorber with some optimal parameters exhibits anaveraged absorption of 94.6% in the range of 200 - 4000 nm (from ultraviolet tomid-infrared) and a band from 200 - 3518 nm having an absorption > 90%. We havedemonstrated in detail the physical mechanisms of the ultra-broad absorption,including the dielectric lossy property of TiN material itself in shorterwavelengths and plasmonic resonances caused by the metallic property of TiNnano-resonators in longer wavelengths. In addition, the absorber showspolarization independent and wide-angle acceptance. Another absorber withdouble TiN nano-rings of different heights has flatter and higher absorptionefficiency (more than 95% absorption) at 200-2860 nm waveband. These propertiesmake the proposed absorbers based on TiN has great potentials in manyapplications, such as light trapping, photovoltaics, thermal emitters.

High-Temperature Ultra-Broad UV-MIR High-Efficiency Absorber Based on Double Ring-Shaped Titanium Nitride Resonators