Mapping and Optimization of Oscillator Strength in Quantum Bragg Mirror Detectors as a Function of their Dimensions

In this work, we estimate the oscillator strength of the optical transitions in quantum Bragg mirror detectors (QBMDs) and determine which structure provides its maximum value. The thicknesses of the quantum wells (QWs) and barriers of the probed structures strongly influence the wavefunctions and, thus, the optical transitions of the active region. For this reason, the structure geometry must be carefully chosen to achieve high oscillator strength at the desired operation energy. Since the QBMD has several QWs and barriers to be optimized, we have performed a series of approximately 350,000 simulations to map the transition energy and the oscillator strength to fully understand the role played by the thickness of each layer of a base structure with 7 quantum wells in total. Due to the computational cost of conducting these simulations for every possible configuration, we shifted to genetic algorithms to find optimal solutions with less constraints in the simulation. Finally, we present a validation of our genetic algorithm, which shows that it consistently finds high-performing structures as validated by the high oscillator strength values obtained. Overall, our study highlights the promising potential of genetic algorithms as a powerful tool for optimizing the properties of QBMDs.