Hi Emmanuel, well my main intention is to launch the guided mode as a source. I am investigating a Bragg grating and I keep getting a shift in the Bragg wavelength, although period of the grating is all set to the chosen Bragg wavelength 1550 nm. The shift is about 5 nm to 6 nm. I have not been able to find where the shift is coming from. I have defined my grating as a sinusoidal structure so that structural offset doesn't effect. If the point source is the problem, I mean all the radiation from the point source could interfere with the grating, so I want to launch the guided fundamental mode as the source, where you wont have any radiating fields anymore. To launch the guided mode, I need to get the location coordinates, which can then be fed into a 1D mode solver, which can be incorporated in the c++ code. The mode solver will deliver the field values of the guided mode for the corresponding location, in turn this can be set as the source in meep, I think!
So to achieve this, I think, you need to make the code output epsilon as a function of location in Y. That is the reason why h5totxt might not do the job for me. I hope you are following me,,,,,any thoughts ?? cheers, Geeth On Thu, Mar 3, 2011 at 6:56 PM, Emmanuel Lambert < [email protected]> wrote: > Geeth, > > The h5totxt can output a matrix of the full slice of eps values. For > example if you take a slice along the y-axis, you'll get a matrix of > epsilon values for (x,z) positions. Since you know the dimensions of > your simulation volume, and the resolution of your simulation, you can > easily derive the (x,z) positions that correspond to these eps values... > > wbr > Emmanuel > > > > On Thu, 2011-03-03 at 18:51 +1100, Geethaka Devendra wrote: > > Hi Emmanuel, > > > > > > Thanks for your reply. Do you mean using the eps.h5 file using the > > h5totxt command to extract a slice? But this only has one data column, > > which the value of the pixel. I need to output both position and its > > epsilon value. > > > > > > I am checking in the functions to see which gives me access to the > > position. Do you know which would do the job? > > > > > > thanks > > regards > > Geeth > > > >
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