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High Performance Graded Quantum Structures: Growth, Applications, Phenomena
Abstract
High-performance, highly-resonant graded quantum well structures were developed under this grant and were successfully applied to direct, electrically-pumped generation of Terahertz-frequency radiation. Additionally, coupled quantum well structures were developed for producing quantum interference of intersubband transitions as a possible step toward lasing without inversion. Special highlights of the research were 1) the generation of continuous, electrically excited Terahertz radiation emission as well as pulsed, optically excited Terahertz radiation emission from highly resonant parabolic quantum wells and 2) the first achievement of increased transparency in intraband quantum well infrared optical absorption as a result of quantum interference among intraband quantum well optical transitions.
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We have observed grating coupled far infrared (FIR) emission from parabolically graded quantum wells (PQWs) by the application of an in‐plane electric field. The peak emission frequency from different wells matches the designed harmonic oscillator frequency for each well, as determined by the curvature of the PQWs. This is a confirmation that the generalized Kohn theorem applies for emission of FIR radiation. © 1996 American Institute of Physics.