1D randomised photonic crystals: the influence as single and dual channel narrowband filter

Abstract

Nowadays, optical filters with high-level performances are highly demanded. While examining the light transmission properties of both periodic and random one-dimensional photonic crystals, it is observed that the random 1D photonic structures have more favorable properties to meet these demands. With the influence of randomness, the novel single and dual-channel narrowband filters at 1550 nm wavelength for optical telecommunication are presented in this study. For designing the narrowband filters, the central wavelength precision, quality factor, and peak transmission are of great importance. The randomness can be attained by permuting the refractive indices of two dielectric materials via the binomial coefficient method. Wherein the light transmission properties are calculated using the Transfer Matrix Method. The proposed filters show ultra-narrowband transmission peaks with the very minimum Full Width at Half Maximum of 0.24 nm in the single-channel narrowband filter; 0.08 nm and 0.095 nm in the dual-channel narrowband filter at the chosen spectral region than the existing narrowband filters based on the defective 1D photonic structures.