Cubic GaN/AlGaN based quantum wells optimized for applications to tunable mid-infrared photodetectors
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We propose a method which delivers optimal cubic GaN/AlGaN quantum well profiles such that both the Stark effect and peak intersubband absorption from the ground to the first excited electronic state, in a prescribed range of bias electric fields, are maximized. Our method relies on the Genetic Algorithm which finds globally optimal structures with a predefined number of embedded layers. We investigate simple rectangular quantum wells with embedded step layers for applications in tunable mid-infrared photodetectors. The effects of band nonparabolicity are taken into account to refine our model.
Keywords:Quantum well / Stark effect / Intersubband absorption / Tunable photodetectors / Genetic algorithm
Source:Optical and Quantum Electronics, 2015, 47, 4, 865-872
- Photonics of micro and nano structured materials (RS-45010)
- MPNS COST ACTION [MP1204 - TERA-MIR], BMBS COST Action - European Network for Skin Cancer Detection using Laser Imaging [BM1205]