Abstract

A Bragg confining structure (BCS)¹ makes use of the carrier-wave-function coherence over a long distance (in the growth direction)² to confine the carrier in the higher- energy spacer layer (SL). The width of the spacer layer is designed to fulfill a Bragg- reflection condition at its interface with properly designed superlattice sections. In other words, the BCS produces a unique eigenstate with a discrete energy level that is higher than the corresponding band offset, This energy falls at the first SL ministop-band; hence the SL sections act as electronic Bragg reflectors (Fig. 1).

© 1993 Optical Society of America