Fundamental Limits in Quantum Well Intersubband Detection
Since the concept of infrared (IR) photodetection by intersubband absorption in superlattices was first proposed and demonstrated by Smith et al.(1), the field of intersubband physics and applications has grown and attracted an increasing interest. Along with the demonstration and the analysis of intersubband absorption(2), came the possibility of studying a very basic quantum system in the laboratory. These efforts revealed the richness of intertweened basic physical effects that have to be understood or taken into account for the full mastering of intersubband physics and applications: Stark(3), depolarization(4,5) and other energy shifts, exchange interactions in doped quantum wells(6), effects of real material systems, polarization(7) and parity selection rules - just to name a few. On the application side another important channel of interest was opened with the realization that very large optical nonlinearities could be achieved through intersubband transitions in superlattices(8-10).
KeywordsCarrier Lifetime Thermal Generation Noise Equivalent Power Intersubband Transition HgCdTe Detector
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