Study of reflectivity and resistance properties of p-type distributed Bragg reflectors with composition graded interfaces

In this work, the reflectivity and series resistance of the p-type distributed Bragg reflectors (DBRs) in vertical cavity surface emitting lasers (VCSELs) under the different thickness of composition graded interface layers, Al composition of the high Al composition layers, Al composition of the low Al composition layers, and the number of DBR periods are simulated and investigated, respectively. To obtain the optimal parameters for the p-type DBRs, the Min-Max normalization method is applied for the comprehensive analysis and comparison of the reflectivity and series resistance. The results show that the series resistance can be effectively reduced by selecting the appropriate parameters of the p-type DBRs.