METHOD TO OPTIMIZE A LIGHT COUPLING WAVEGUIDE

摘要

The present invention concerns a method for constructing a light coupling system wherein a grating is manufactured on the surface of a multimode waveguide and defines the entrance of the waveguide for an incident light beam said grating comprising a repetition of patterns. The grating is defined by a set of parameters comprising: • grating period (P) separating two adjacent patterns • grating depth (d) between the highest and the lowest point of the pattern • incident angle mean value (Θ) of the incident light with respect to the waveguide. The method comprises a step of optimization of the set of parameters to obtain an optimized second set of parameters in order to obtain a transmission efficiency (Ce) of the incident light into said waveguide for the first or the second diffractive order exceeding 35% for unpolarized light or exceeding 50% for polarized light at a given wavelength of the incident light.