Fig. 1. (a) Schematic of the proposed color filters incorporating a-Si:H NPs. Incident white light is filtered into three primary subtractive colors of CMY. (b) Top view and (c) tilt view of SEM images for the three primary subtractive color filters for CMY with diameters of D=70, 100, and 120 nm, respectively. For the magenta filter, inset in (b) on top right of the SEM image includes the FIB cross-section image depicting the height of the a-Si:H NP. Inset in (c) for the tilt view shows the captured colored images.

Fig. 2. (a) Measured and calculated transmission spectra for the subtractive color filters with diameters of D=70, 100, and 120 nm. (b) Color responses corresponding to the transmission spectra in (a) mapped in the CIE 1931 chromaticity diagram.

Fig. 3. (a) (i) Simulated and (ii) measured transmission spectra for the color filter when the NP diameter is varied from 60 to 130 nm in increments of 10 nm. (b) Color responses corresponding to the transmission spectra in (a) are mapped in the CIE 1931 chromaticity diagram. Insets in (a)(ii) show the captured vivid color images.

Fig. 4. (a) Simulated transmission (T), reflection (R), and absorption (A) spectra, denoted by the arrow, for a typical filter with D=100nm. (b) Calculated cross-sections pertaining to the peak absorption (denoted by the arrow), scattering, and extinction, where (c) E-field and (d) H-field profiles are superimposed on the vector plot for the MD, and (e) E-field and (f) H-field profiles are superimposed on the vector plot for the ED at the resonance wavelength of 565 nm for the filter with D=100nm.

Fig. 5. Contour plot of the transmission spectra in terms of the varied angles of incidence: (a), (b) ‘simulated’ and (c), (d) ‘measured’ cases for the TE and TM polarizations for a filter with D=100nm.