Patent ID: 7821091

Claim:
A photo detector comprising: an active semiconductor layer, in which positively doped regions and negatively doped regions are formed, each comprising at least one electric contact area; and a grating of a grating material being directly or indirectly arranged on top of a surface of the active semiconductor layer and being patterned in uninterrupted first strips, that are arranged in a first direction and in parallel to each other with respect to their respective center lines in a first predetermined interval, and second strips, that are arranged in a second direction and in parallel to each other with respect to their respective center lines in a second predetermined interval, wherein the second strips comprise at least one interruption in a region between each two neighboring first strips in form of a predetermined gap, and the positively doped regions and negatively doped regions each being arranged as strips in parallel with the first strips of the grating material with respect to their respective center lines such that in a region between each two neighboring first strips of the grating material in their respective projections into the active semiconductor layer alternately either one of the positively doped regions or one of the negatively doped regions is arranged.