Patent ID: 7425509

Claim:
A method for forming patterns aligned on either side of a thin film deposited on a substrate, the method comprising local etching of the thin film in order to form a first marking characterized in that it comprises: depositing a first pattern layer on the thin film, deposition of the first pattern layer preceding or following local etching of the thin film, a first lithography step for defining a location of a first pattern, with alignment of the first pattern location relatively to the first marking, local etching of the first pattern layer in order to form a first pattern, depositing a first bonding layer for covering the first marking and the first pattern, turning over the obtained structure following the deposition of the first bonding layer, suppressing the substrate, a step for etching the first bonding layer in order to form a second marking at the location of the first marking, a step for depositing a second pattern layer, a second lithography step for defining a location of a second pattern, with alignment of the second pattern location relatively to the second marking, and a step for etching the second pattern layer in order to form the second pattern.