In this work, we demonstrate a lithography-free, polarization insensitive, angle-invariant trans-reflective color filter, which is composed of cost-effective, at and lossless dielectric ultra-thin films. The films with higher indices behave like a mirror of a Fabry Perot (FP) interferometer enclosing a layer of lower refractive index material between them. The transmission spectrum for the basic additive (red, green, blue (RGB)) and subtractive (cyan, magenta and yellow (CMY)) colors is studied first. The dimensions of the device are obtained with the help of the particle swarm optimization (PSO) algorithm for optimal results. The transmission/reflection efficiency obtained in the proposed device is above 99% with minimum full width at half maximum (FWHM) value of 74 nm at lower wavelengths. Similarly, the change in the cavity thickness sweeps the resonance wavelength across the visible regime. A minimum cross talk between blue and red colors is observed at higher wavelengths. The proposed design involves one deposition run, thus can be implemented for numerous applications.
In this paper a theoretical study of highly selective plasmonic color filters is demonstrated. The filter design consist of a perforated aluminium film, where nanoholes are arranged in a square lattice. A hybrid substrate is implemented as a dielectric layer which allows high selectivity and minimum spectral cross talk. The impact of the hole periodicity, thicknesses of Si3N4 and metallic layer on the device performance is highlighted. The optical resonance transmission properties of the simulated plasmonic color filter including resonance position, transmission efficiency, figure of merit, and spectral bandwidth of resonance peak are also analyzed thoroughly.
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