Hi, I'm trying to simulate total light reflection in a SU-8 waveguide (refractive index 1.6, exterior domain: air) structured by a first straight section split into two symmetrical S-shaped bends followed by a second straight section. The rays are released from a point source with a cone angle of π/6.
First step I've modeled the straight section and one bend. I've studied the bend radius of curvature with Parametric Sweep and found the optimal value in order to have total reflection.
Second step I've added the second bend to design a S-shaped bend followed by the second straight section.I've studied the bend radius of curvature with Parametric Sweep as before.
Once I've found the two optimal radius of curvature values, I've copied it and used "Mirror" to have a structure with double thickness in the first straight section from the rest and with two symmetrical S-haped bends.
?? If I compute the final structure, rays undergo refraction since the beginning, even if the incident angle is the same. Why there's reflection anymore?
Thank you, Marta