“…Nevertheless from the viewpoint of scientific elegance, or more pragmatically cost, monolithic integration is desirable. Therefore, we have focussed in this paper, on devices suitable for monolithic integration, although in passing we note some of the significant work in hybridisation in the these early years [3,5,7,12,15,16,18,19,29,30,[37][38][39][40][41][42][43][44][45][46][47][48][49][50].…”