Infrared Broadband Reflectors by Nano-Layered Periodic Cryolite/Semiconducting Media

This simulation work is based on the analysis of the dispersion characteristics of a nanolayered periodic binary PhC of cryolite and semiconducting layers by using the transfer matrix approach. The dispersion curves and reflection through layered media for optical waves are compared at oblique incidences, and some insights are drawn. It is observed that width of band gap decreases or remains same with increase in the incident angle for 1DPhC, while the bandwidth increases with the normalized frequency at fixed incidence that shows the characteristics of Bragg’s gap. The results of the manuscript have promising applications in design of tunable optical filters, broadband reflectors, lasers, and modern communication industry.