Figure 1
Plasmonic-nanocavity-based angle robust colour filtering.
(a) A schematic of the proposed structure and corresponding SEM image of a fabricated device with width (W) = 45 nm, depth (D) = 160 nm and period (P) = 180 nm with θ as the incident angle of light. (b) Polarization charge and Poynting vector distribution of light funneled into these nano-grooves, presented with the red–blue surface plot and purple arrows, respectively. (c) Intensity distribution of the magnetic-field Hy at resonance, P = 180, W = 50 and D = 170 nm. (d) Reflection (simulated in solid lines and measured in dash lines) and measured absorption spectra (inset, dashed lines) at D = 110, 130 and 170 nm in blue, green and red curves, given fixed P = 180 and W = 50 nm at normal incidence. (e) Reflection spectra at fixed P = 180 nm and D = 170 nm demonstrating the three basic colours of the CMY colour model, cyan (C), magenta (M) and yellow (Y), with varying W = 40, 60 and 90 nm at normal incidence.
