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In this research, a mid-infrared wide-angle ultra-broadband perfect absorberwhich composed of pyramid grating structure has been comprehensively studied.The structure was operated in the reststrahlem band of SiC and with thepresence of surface phonon resonance(SPhR), the perfect absorption was observedin the region between 10.25 and 10.85 $\mu m$. We explain the mechanism of thisstructure with the help of PLC circuit model due to the independence ofmagnetic polaritons. More over, by studying the resonance behavior of differentwavelength, we bridged the continuous perfect absorption band and the discretpeak in 11.05 $\mu m$(emerge two close absorption band together) bymodification of the geometry. The absorption band has been sufficientlybroadened. More over, both 1-D and 2-D periodic structure has been consideredand the response of different incident angles and polarized angles have beenstudied and a omnidirectional and polarization insensitive structure can berealized which may be a candidate of several sensor applications inmeteorology. The simulation was conducted by the Rigorous Coupled WaveMethod(RCWA).

Ultra-broad band perfect absorption realized by phonon-photon resonance in periodic polar dielectric material based pyramid structure