Fig. 6
From: Ultra-narrow Band Perfect Absorber and Its Application as Plasmonic Sensor in the Visible Region
a The modified structure containing a trapezoidal nanoribbon with a same angle θ to the triangular nanoribbon. b, c Comparison of reflection spectra between the nanostructures with different heights h, when the θ keep unchanged. d, e Comparison of reflection spectra between the nanostructures with different angles θ, when the height h = 15 nm. f The modified structure with the roughness of the gold/dielectric surface and the passivation treatment for all sharp angles. g Comparison of reflection spectra between the modified structure and the original structure, when the l is set as 3 nm