Fig. 4

G (a) and F (b) for different incidence signal and pump angles. Both figures depict the best configurations for the detection. The calculation were performed for collimated beams. This structure needs a pump angle of \(\theta _{p}^{i} = 11.83^{\circ }\) to detect infrared light. The gaussian ponderated integration of G and F inside the rectangle leads to their focused value. Evolution of G (c) and F (d) values for a focused configuration with the signal half-cone angle φ_s and a fixed pump half-cone angle of φ_p=2.0^∘