Dear Meep community, I stumbled upon a strange effect while trying to use a plane wave source. I am examining a structure, that is infinitely homogenous in z-direction and infinitely periodic in x-direction, say, like a line grid cross section. For this purpose, I implement one element of the structure in the x-y-plane and set a (vector3 0 0 0) k-point, while closing the cell in the y-direction with pml layers. To illuminate the device with plane waves from the top, I place a continuous line source above, with (size sx 0 0), where sx is the same variable used to define the cell size. Thus, I would expect the periodicity condition to generate even wavefronts all over the cell. In fact now, I see the fields spatially oscillating in the x-direction with the effect strongest where the line source meets the cell edge. Obviously, there is a pixel of source missing, which creates a point source like behaviour at the cell edge and I can even fix this, by defining the source length a hint larger than the cell width, but why is this happening? Has somebody else seen this behaviour? How can I properly define my source without having to reset the source length by hand in every new setup? (because, if you add too much, of course, meep will complain that the source is actually larger than the cell, obviously you just need to fill that one extra pixel...) Any ideas? Thanks in advance for every answer!
Sebastian Wolf Diploma Student Solar Cells - Development and Characterization Fraunhofer Institute for Solar Energy Systems ISE Heidenhofstrasse 2, 79110 Freiburg, Germany sebastian.w...@ise.fraunhofer.de http://www.ise.fraunhofer.de
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