Study of tunable band-gap properties in one-dimensional binary photonic crystals

In this paper, the photonic band-gap of one-dimensional photonic crystals with (AB)(N) configuration is presented and thoroughly discussed based on transfer matrix method (TMM). Results show that band-gap properties including the width, central wavelength, and reflectance are directly related to refractive index, thickness, periodic number of dielectric materials, and incidence angle. By increasing the periodic number from 3 to 30, the reflectance is gradually enhanced till nearly stable. As both thickness ratio and refractive index ratio between two dielectric materials are increased, the band-gap width is remarkably extended. In addition, while the incidence angle is varied from 0(omicron) to 80(omicron), the band-gap width is compressed (TM wave) and slightly broadened (TE wave), and the central wavelength of band-gap is shifted to shorter wavelength compared to the case of normal incidence.