Fabrication of low-cost and high-reflectivity bottom mirrors for Si-based micro-cavity devices

A novel and simple way to prepare high-reflectivity bottom mirrors for Si-based micro-cavity devices is reported. The bottom mirror was deposited in the hole, which was etched from the backside of the sample by ethylenediaminepyrocatechol-water solution with the buried SiO/sub 2/ layer in the silicon-on-insulator substrate as the etching-stop layer. The high-reflectivity of the bottom mirror deposited in the hole and the narrow full width at half maximum of the cavity formed by this method both indicate the successful preparation of the bottom mirror for Si-based micro-cavity devices.