A
broadband polarization-independent long-wave
infrared absorber plate belongs to
infrared absorber devices, overcomes the shortcomings that a conventional
infrared absorber cannot draw the absorptivity, the
absorption bandwidth and the
duty cycle into consideration, and is
broadband, polarization-dependent and compact in structure. The
broadband polarization-independent long-wave infrared absorber plate sequentially comprises a substrate layer, a bottom
metal layer, a
dielectric layer and a top
metal layer from bottom to top, wherein the top
metal layer consists of a plurality of metal graphic groups in periodically array arrangement, the metal graphic groups are the same in structure, each metal graphic group consists of a plurality of metal graphic units in symmetrical arrangement and with approximate sizes, and each metal graphic unit, together with the
dielectric layer and the bottom metal layer under
vertical projection of the corresponding metal graphic unit, forms a resonant unit. The broadband polarization-independent long-wave infrared absorber plate can realize perfect absorption of electromagnetic
waves with specific wavelengths, the resonant units can realize polarization-independent absorption and ultra-wide-band absorption, the structures and the distances of the resonant units are optimized, the structural
duty cycle can be improved, and device
miniaturization can be realized.