Abstract
Polarization-insensitive thin-film absorber is proposed by right-angled triangular grating. Combining the electric field distribution under two polarizations, the physical mechanism of absorption is analyzed using the finite element method. The presented results show that the average absorption efficiency exceeds 90.10% with a spectral range of 300-680 nm, and the incident angle can reach 50°. Compared with reference planar and triangular structures, the thin-film visible absorber presented has better absorption characteristics. Furthermore, compared with the reported visible absorber by rectangular grating, the visible absorber designed in this work has enhanced absorption spectrum bandwidth of 380 nm and wide angle of 50°. It is believed that the novel absorber has great potential in the field of visible light absorber.
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