Modeling of a wide band pass optical filter based on 1D ternary dielectric–metallic–dielectricphotonic crystals

Abstract

We suggest ternary structures of dielectric–metal–dielectric photonic structuresto be used as optical band pass filters. We theoretically study and evaluate theoptical properties of these one-dimensional structures. ZnSe/metal/LiF andSiC/metal/SiO2 with three metals, namely silver, gold and copper, are suggested as the optical filters. Wecalculated the reflectance and the transmittance of electromagnetic waves (EMW) out ofthese structures using the transfer matrix method. These calculations take place for thecase of normal and oblique incidences using actual measured values for the indices ofrefraction. Our calculations show that such photonic crystal (PC) filters have a well shapedpass band in the visible range and block efficiently ultraviolet and infrared EMW.Our results show that PCs having silver as the metal layer are preferred to thosehaving gold and copper because of the high transmittance in the visible range. ASiC/Ag/SiO2 filter shows better performance than a ZnSe/Ag/LiF one from thetransmittance and the shape of the band points of view. Such a filtershows a well shaped wide band over the range of incident angles from0° to80°.