Arrangement of a layer to be heated on a substrate

摘要

The substrate, e.g. of silicon, has a glass layer (3) applied to part of the top surface of the silicon substrate, with a heating electrode (21) used for heating a selected region (35) of the glass layer. A recess (410) is provided in the substrate surface below the heated region, for thermally isolating the latter from the substrate which has a higher heat conductivity than the glass.