Fabrication and Properties of High-Performance Graded Quantum Structures
Final rept. 1 Jul 94-30 Jun 97
CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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In this reporting period, we have extended this work by creating vertical transport structures to allow for resonant injection into the higher levels of a parabolic quantum well to improve the efficiency and intensity of Terahertz emission. Measurements showed the clear presence of coherence and resonant tunneling behavior for wells as wide as 1000 A. Then, vertically injected Terahertz emission devices were made with multiple cascaded PQWs 30 to 10 wells sandwiched between n contact layers. The initial results from these devices has shown a factor of 4 improvement in emission power over the in-plane excitation devices described above. The current power level of 30 nW for these devices is comparable to the state of the art for other techniques of Terahertz generation at these frequencies.
- Quantum Theory and Relativity