Broadening and tuning of omni-directional reflection gap in a 1D photonic crystal consisting semiconducting constituents

The effect of temperature on omni-directional gap (ODG) in a dispersive one-dimensional photonic crystal has been investigated simultaneously considering thermal expansion effect and thermo-optic effect. The proposed structure consists of a periodic array of alternate layers of ZnS and Ge respectively, as the materials of low and high refractive index materials. The refractive index of both layers is taken as a function of temperature and wavelength both. The effect of temperature on ODR band and the central wavelength of this ODR have been studied. This ODR can be tuned by varying the temperature of the geometry. The propagation characteristics of the proposed structure are analyzed by the transfer matrix method.