Full Title

Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics > for the control of the intensity, phase, polarisation or colour (G02F1/29, G02F1/35 take precedence) > based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction (G02F1/03 takes precedence) > Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells