Patent ID: 8450132
Filing Date: 2013-05-28
Classification: B81B,G02B

Abstract:
1. A method for fabricating, in a monocrystalline silicon wafer, a micromirror linked by at least two thermally deformable arms, comprising the steps of: depositing and etching, on the front face of the wafer, layers forming the arms; etching the wafer in a region of the back face such that only a thin portion of the wafer remains in the region of formation of the micromirror and the arms; performing an anisotropic etch to delimit the micromirror and the wafer, such that the thin portion of the wafer remains only in the areas of the micromirror and the arms; and performing an isotropic etch to remove the thin portion of the wafer under the arms; wherein the etching step for forming the arms is performed following the shape of the arms and forms a plurality of holes traversing the arms, the plurality of holes having a diameter less than the width of the arms and being positioned at edges of the region separating the micromirror and the wafer on the side of the micromirror and on the side of the portions of the wafer remaining after the anisotropic etching step; and wherein, before the step of forming the arms, before the anisotropic etching step or before the isotropic etching step, a plurality of parallel metallic lines are formed in the area of the formation of the micromirror, outside the region for fixing the arms.