Device having an anodic porous region surrounded by a trench having an electrical isolation barrier

A method of manufacturing an electrical device comprising an anodic porous oxide region, the method comprising:

• forming an anodizable metal layer on a metal barrier layer;
• forming a trench in the anodizable metal layer around a portion of the anodizable metal layer which will include the anodic porous oxide region after anodizing, the trench reaching the metal barrier layer;
• forming a liner at least on a wall of the trench on a side of a portion of the anodizable metal layer having an opening onto the anodic porous oxide region;
• forming a hard mask above the trenches and the liner, having at least an opening onto the portion of the anodizable metal layer;
• and
• anodizing the portion of the anodizable metal layer so as to obtain the anodic porous oxide region and form an electrical device that includes:
• the metal barrier layer;
• the anodic porous oxide region on the metal barrier layer;
• the trench around the anodic porous oxide region and reaching the metal barrier laver;
• the liner at least on the wall of the trench on a side of the anodic porous oxide region forming an electrical isolation barrier and having the opening onto the anodic porous oxide region;
• and
• the hard mask arranged above the trenches and the liner having at least an opening onto the anodic porous oxide region.