Hi, Has anybody here ever used SOS (silicon on sapphire) wafers before? And any recommendation about where to order? I am thinking to buy wafers where the substrate is transparent but could stand higher temperature. The candidates are silicon on fused silica or SOS. The former seems rare (is it?), so I choose the latter. Thank you very much! Chong -- Chong Liu Graduate Yang's Group Department of Chemistry University of California, Berkeley