Hello, steven Thank you for your reply. I still have some questions. First, if I want to get scattered fields, I did the simulation twice. One has object, one without object. Then I use the fields (Ez, Hx, Hy) that I got with object subtract the fields without the object. These fields are the scattered fields, right? Second, for my ntf code, I want to make the code match the data gotten by meep. I set the parameters like this:
Eps0=1 Mu0=1 Z (intrinsic impedance of free space) =1 K=1 (the wave vector of incident wave) Omiga (angular frequency)=1 Wavelength=a=1 (also a=wavelength) Wl=40 (resolution) Are these parameters right? Especially for the omiga, for my ntf code I used to set eps0, mu0... as the real value (8.85e-12...) and omiga=pi/wl, so now how should I set the omiga then it can match the data from meep? Thank you very much, Lei ________________________________ From: [EMAIL PROTECTED] on behalf of Steven G. Johnson Sent: Fri 8/1/2008 3:36 PM To: [email protected] Subject: Re: [Meep-discuss] Questions about using meep to do near to farfield transformation. On Jul 31, 2008, at 12:33 PM, Zhu, Lei wrote: In fact, I just need the scattered E and H fields tangential to a virtual rectangle shape surface completely surrounding the object or scatterer. Is this right? Yes, I believe so. Below is my code. Can I take the E and H at the same timestep 300 or I should take E at timestep 300 and get the average value of H at 299.5 and 300.5? You should use the (synchronized-magnetic ...) function, new in Meep 0.20, which will due the averaging of H for you, in order to get E and H at the same time. See: http://ab-initio.mit.edu/wiki/index.php/Synchronizing_the_magnetic_and_electric_fields Steven
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