Fig.3.

a Absorption spectra versus diameter of the top TiN nano-disk with the parameters fixed at p _x = 200 nm, and t ₁ = t ₂ = 50 nm. b Absorption spectra versus thickness of the top TiN nano-disks with p _x = 200 nm, d = 120 nm, and t ₂ = 50 nm. c Absorption spectra versus thickness of the SiO₂ layer with p _x = 200 nm, d = 120 nm, and t ₁ = 50 nm. d Spectra versus polarization angle of the incident light with parameters set as p _x = 200 nm, d = 120 nm, and t ₁ = t ₂ = 50 nm. The color bar denotes the absorption value