Abstract: An integrated optical coupler including in the medium separating a first integrated waveguide from a second substantially parallel integrated waveguide, a succession of strips parallel to one another and orthogonal to the general direction of the waveguides, said strips being made of a material having an absorption preventing the propagation of an electromagnetic wave across its volume, and having: a length H equal to k?/2nmedium, where k is an integer, ? is the central wavelength used, and nmedium is the optical index of the medium between the waveguides; a period P smaller than ?/2nmedium; and ends at a distance shorter than ?/10 from the waveguides.

Abstract: An element of photodetection of a radiation having a wavelength in vacuum close to a value ?0, including: a semiconductor layer of index ns and of a thickness ranging between ?0/4 ns and ?0/20 ns; on one side of the semiconductor layer, a first medium of index n1 smaller than ns, transparent to said wavelength; on the other side of the semiconductor layer: a region of a second medium of index n2 smaller than ns, having a width L substantially equal to ?0/ns and, on either side of said region, a third medium, of index n3 greater than index n2, forming a reflective interface with the second medium.