Abstract

Many systems are contemplated that use surface-normal multiple quantum well (MQW) modulators to imprint data on optical beams. These include "smart pixel" digital processors,¹ as well as image processors that employ spatial light modulators. These modulators are typically pi( MQW)-n diodes, grown by techniques such as Molecular Beam Epitaxy (MBE), wherein an integral multilayer mirror is produced underneath the MQW. By reverse biasing the diode the MQW’s absorption is modified and hence the reflectivity of the device is modulated. In simple designs a perfect anti-reflection coating is placed on the surface so multiple reflections do not occur within the modulator. This has the advantage that no strict control of the overall thickness of the device is required.

© 1995 Optical Society of America