Patent ID: 8149493

Claim:
A device comprising: a substrate; a light transmission structure formed of a base layer disposed on a top surface of the substrate and a rib formed on the base layer, the light transmission structure comprising: a first doped region, a first portion of the first doped region located in the base layer and a second portion of the first doped region located in the rib, a second doped region, the second region doped oppositely to the first region, a lateral junction between a part of the first doped region and a part of the second doped region, the lateral junction oriented substantially perpendicular to the top surface of the substrate, and a vertical junction between a part of the first doped region and a part of the second doped region, the vertical junction oriented substantially parallel to the top surface of the substrate; a first contact in electrical contact with the first region; and a second contact in electrical contact with the second region.