Dear researchers, I am trying to launch two out-of-phase pulses (the third pulse of the attached image) into a plasmonic waveguide in FDTD Lumerical, but I do not know how, Is it ant way? Thanks in advance.
Thanks, but I do not know how to change the phase of the input, it seems that defining the phase is not possible is FDTD. the type of the input used is the mode source.
Hello Azadeh Karimi,
If you have the possibility to write freely the equation of your source in FDTD Lumerical than try to write a plane wave multiplied by two Gaussian with opposite signs with a delay between them.
To emit an impulse, I use to write something like : E0.exp(-i(kz-wt).Gaussian.
I think that if you do the same and you multiply by another Gaussian with negative sign, it should give you two impulses as drown in your picture.
Hello @Azadeh Karimi ,
I made a mistake in my previous answer and here is a correction: The Gaussians with opposite signs must be summed and multiplied by the plane wave.
I did calculations for you to show you that it seems working.
E0.exp(-i(2*pi*x/lambda) )*(exp(-x^2/0,5^2)-exp(-(x+4)^2/0,5^2)).
E0 = 1
Lambda = 0.5
The first impulse is at x = 0 and the second is at x = -4.
I took an arbitrary width of 0.5.
An equation with the same form in the time domain should work in FDTD if you have a possibility to add your source freely.
Hi Masoud Kamran ,
Thank you for your answer, please take a look at the attached file. Actually I had tried changing the phase option before, however, as it can be seen, there is no change in the temporal input.
Hi Azeddine T.,
Thank you for your time and help, unfortunately, it is not possible to write the equation of the source.
Hi,
I know, I just wanted to show that if I launch one source with the phase set at 180, the temporal input is not inverse with respect to the time axis.
Hi,
I put -1 instead of +1, but when I checked the source again, before run the simulation -1 had been changed to 0, and after simulation, the temporal input was 0, anyway I really appreciate your help and look for more help if you have another solution for this problem. Thank you again.
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