Accession Number : ADA329745

Title :   Fabrication and Properties of High-Performance Graded Quantum Structures

Descriptive Note : Final rept. 1 Jul 94-30 Jun 97

Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

Personal Author(s) : Gossard,

PDF Url : ADA329745

Report Date : 30 JUL 1997

Pagination or Media Count : 3

Abstract : 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.

Descriptors :   *QUANTUM WELLS, *QUANTUM EFFICIENCY, EXCITATION, TUNNELING(ELECTRONICS), FAR INFRARED RADIATION, PHOTOELECTRIC EMISSION, DOPING, ELECTROMAGNETIC SPECTRA.

Subject Categories : Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE