Abstract
Long-wave infrared perfect absorbers have many potential applications such as thermal imaging and materials identifications. In contrast with previously reported absorbers which result from either electric or magnetic resonances, we propose a dual-band absorber through exciting the hybrid mode supported by the reflective phase-gradient metasurface. Surface wave mode and dipole-like resonance are respectively investigated to demonstrate the origins of two absorption peaks near 8.1 µm and 14.1 µm. Eigen-mode calculations agree well with the full-wave simulation results. To clarify the role of phase gradient metasurface in enhancing the absorbance, comparisons with single unit-cell metasurfaces are illustrated. The absorptions for incidence with different polarization states also confirm phase gradient design. Our findings may find applications in the long-wave infrared filters, minerals identifications and optoelectronic detectors.
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