Dear meep users,
I succeeded in simulating a phc waveguide (direction x) with a coupled cavity for a phc slab structure composed of holes(periodicity along x and y). I try to understand the coupling mechanism in order to enhance the design of my cavity to cause either the reflection or transmission. For that, I put a source in the input waveguide and look the propagation of the H field, and the transmission/reflection spectrum. I understand that the Qvertical affect the coefficients of reflection and transmission, but I don't get why in certain case the light prefers go to backward or forward direction according to Qin-plane value. Intuitively(but wrong), due to the symmetry of my structure (the cavity is centered on the x-axis) along x, the coefficient for transmission and reflection should be the same. Nevertheless, when I add another cavity above the waveguide (I obtained so a symmetry along Y axis ), after running simulation, I can see the symmetry of cavity mode are the same, and I obtained the same coefficient for reflection and transmission what I expected. Why with only one cavity I haven't the same properties? If someone can give me some clues , it would be very helpful. Do I have to look on the symmetries of the cavity mode and the symmetries of the waveguide mode, and if it is the case how can do this? Best Regards, Cedric Perrotton Master student PS: I know it is not a meep problem, but I didn't know where I can ask this question. _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
