I study the thermal emission properties of periodic multilayer arrays of subwavelength particles made of silicon carbide embedded in a zinc selenide host medium. A unique interplay between the intrinsic phonon-polariton resonance of the single particle and the field thermally emitted from the different arrays of particles gives rise to a comb of highly coherent absorption/emissivity lines around 10.6 μm, ensuing ideal conditions to achieve long-wave infrared coherent sources.

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