Accession Number : ADP007836

Title :   Large Excitonic Blue-Shift and Nonlinearity in Narrow Asymmetric Coupled Quantum Wells,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Ding, Y. J. ; Guo, C. L. ; Li, S. ; Khurgin, J. B. ; Law, K. K.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Conventional self-electrooptic effect device (SEED) is based on the so-called quantum-confined Stark effect (QCSE), which results in the red-shift of the effective bandgap. Thus, it has significant residual absorption and requires high operational voltage. In the attempt to overcome these disadvantages, the so-called blue-shifting SEED schemes were proposed. Blue-shifting SEED can be based on QCSE in strained <111> structures and Wannier-Stark localization. Here, we report our observation of blue-shift of heavy-hole excitonic transition and third-order optical nonlinearity in narrow GaAs/Al.Ga1-xAs asymmetric coupled quantum wells (ACQW's) based on the anticrossing of strongly coupled heavy-hole levels in two narrow ACQW's for the first time.

Descriptors :   *EXCITONS, *QUANTUM ELECTRONICS, ABSORPTION, BLUE(COLOR), ELECTRONS, ELECTROOPTICS, OBSERVATION, RESIDUALS, SHIFTING, STARK EFFECT, STRUCTURES, TIME, TRANSITIONS, VOLTAGE.

Subject Categories : Electricity and Magnetism
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE