Patent ID: 8636911
Filing Date: 2014-01-28
Classification: B81B,G02B

Abstract:
1. A method of fabricating a MEMS scanning mirror having a tunable resonance frequency comprising: providing a silicon-on-insulator wafer comprising a top silicon layer, a bottom silicon layer, and a silicon dioxide layer between said top and said bottom silicon layers; forming a silicon dioxide hard mask on said bottom silicon layer and patterning said hard mask; and etching away portions of said bottom silicon layer and said silicon dioxide layer from a backside of said silicon-on-insulator wafer and etching away portions of said top silicon layer from said backside directly underlying said MEMS scanning mirror to tune the resonance frequency to a particular value wherein a depth of said portions of said top silicon layer is chosen to achieve said particular resonance frequency for said MEMS scanning mirror and wherein said bottom and top silicon layers are etched using said silicon dioxide hard mask and said silicon dioxide layer as hard masks and wherein said silicon dioxide layer is etched using said silicon layer as a hard mask.