Abstract
The feasibility of a distributed Bragg reflector (DBR) based on wide band gap II-VI semiconducting alloys is reported. The reflectivity spectra of a Zn0.66Mg0.34Se/Zn0.74Cd0.26Se DBR are calculated within the stratified medium theory using matrix representation. The composition x for each alloy is taken in such a manner to obtain a convenient difference between the respective refractive indices of each constituent material. Both normal and oblique incidence are considered. For both cases the effect of the number of pairs has been studied. We found out that the reflectivity maximum is enhanced as the number of pairs increases. The DBR bandwidth is found to be dependent on the refractive indices difference. The reflectivity spectrum is shifted towards smaller wavelengths, and the Bragg wavelength is diminished as the angle of incidence is augmented.
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