Prestructured substrate for the production of photonic components, associated photonic circuit and manufacturing method

A substrate locally pre-structured for the production of photonic components, comprising:

• a solid part made of silicon;
• a first localised region of the substrate, comprising:
• a heat dissipation layer, produced in a localised manner on the surface of the solid part, such that it only covers a portion of the surface of the solid part, and made of a material of which the refractive index is less than that of silicon;
• a wave guide on the heat dissipation layer;
• a second localised region of the substrate, separate from the first region, comprising:
• an oxide layer produced in a localised manner on the surface of the solid part such that it only covers a portion of the surface of the solid part, the oxide having a heat conductivity less than that of the material of the heat dissipation layer;
• a wave guide on the oxide layer,
• wherein the heat dissipation layer and oxide layer are arranged directly on the surface of the solid part of the substrate, and
• in which the heat dissipation layer of the first region forms a confined area of the substrate which is surrounded by oxide at least on all sides in a planar direction of the substrate.