Abstract
In this paper, polarization-independent multi-band infrared perfect absorption has been demonstrated by using hexagonal nanorods coupled with the gold substrate. Numerical simulations of the finite-difference time-domain (FDTD) method indicate that perfect absorption can be achieved due to the Fabry-Perot gap plasmonic resonances, all the incident electromagnetic energy is confined in the Al2O3gap layer. Septuple-band perfect absorption with maximum absorbance up to 99.4% and the lowest above 82.5% is achieved in the range of 700−2000 nm. Angle and polarization-dependent performance of the septuple-band absorption is also investigated. Moreover, the spectral position of the absorption peak can be tuned by adjusting the geometrical parameters of the proposed absorber. Besides, the proposed septuple-band absorber has excellent absorption stability and polarization-independent. The proposed absorber may find potential applications in the fields of multiband sensor and plasmonic detection.
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