Hello again, Do I need to write a step function of my own to get the values?
I tried the following: (define (myoutput) (print "myoutput:, " (meep-time) ", " (get-field-point Ez (vector3 0 0)) "\n")) (run-until 200 my-output) Simulation did not run due to the following error ERROR: Unbound variable: my-output Regards, Sanchit --- On Tue, 4/27/10, Sanchit Khatavkar <[email protected]> wrote: From: Sanchit Khatavkar <[email protected]> Subject: Re: [Meep-discuss] How to get the transmitted power for a fixed frequency (Continuous wave source) To: "Mischa Megens" <[email protected]> Date: Tuesday, April 27, 2010, 9:58 PM Hello Mischa, Thanks for your reply. I tried to remove the add-flux, did not define any flux region. I got the snapshots of the fields at the end of the time-stepping. The only hitch is that I am not able to get the exact values of the transmitted power and the incident power. It will be really helpful if you can tell me how I get those values. Regards, Sanchit --- On Tue, 4/27/10, Mischa Megens <[email protected]> wrote: From: Mischa Megens <[email protected]> Subject: Re: [Meep-discuss] How to get the transmitted power for a fixed frequency (Continuous wave source) To: "Sanchit Khatavkar" <[email protected]> Date: Tuesday, April 27, 2010, 9:58 AM Hi Sanchit, The add-flux is intended for use with pulsed sources only. It will accumulate a fourier transform to detect the energy at various frequencies you specify. If you have a continuous source and you run it long enough for the transients to disappear, then you already know the frequency, and there is no need for Fourier transforming or (add-flux ...). You can just take a snapshot of the fields (you could run meep with complex fields if you want complex fields; or you could take two snapshots 90 degrees in phase apart). Indeed add-flux will give you the wrong answer with a continuous source (it is not intended for running when sources are still on) Good luck, m. Sanchit Khatavkar wrote: Dear Alexandr, Thanks for your reply. You are right. The CW source has only one frequency in the flux spectrum. I am attaching my ctl file for your reference. "add-flux" needs 3 parameters, namely "fcen" "df" "nfreq" alongwith the flux-regions... (Quoting from Meep Reference) Since a continuous source sends out light of a single frequency, what do we specify for "df" and "nfreq". As a trial, I gave the fixed frequency as "fcen", 0 as "df" and 1 as "nfreq". I am not sure whether if this is the right approach. Kindly advise. Regards, Sanchit _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
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