Hi, We need to fill deep trenches (1*10um) etched in the silicon layer of SOI wafer with a material that has a refraction index close to but different from that of Si (3.5). 1.Could someone recommend such a material? 2.Could someone recommend the best process - PECVD, LPCVD? Thanx, David _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx