Patent ID: 7749868
Filing Date: 2010-07-06
Classification: G02B,H01L

Abstract:
1. A process of forming a curved profile on a semiconductor substrate, said process comprising the steps of: preparing said semiconductor substrate having a top surface and a bottom surface opposed to each other; forming an anode on said bottom surface, placing said semiconductor substrate in an electrolyte solution; flowing a current between said anode and a cathode within said solution to convert the top surface of said substrate to a varying depth from portions to portions, leaving a porous layer in said top surface; and removing said porous layer from said substrate to leave a curved surface on said top surface, wherein said anode is deposited on said bottom surface to provide a consolidated structure and is configured to provide a predetermined distribution of an electric field intensity which varies from portion to portions of said substrate across said to and bottom surfaces of said substrate, thereby providing said porous layer having the varying depth in order to match the distribution of said electric field intensity, wherein said anode is formed partially on said bottom surface of the semiconductor substrate to provide a predetermined anode pattern which defines said predetermined distribution of said electric field intensity, and wherein said anode pattern is formed by the steps of: depositing an electrically conductive layer on the bottom surface of said substrate; removing a portion of said conductive layer to form a corresponding opening in said conductive layer.