On 4/4/19 09:09, Quang Nguyen wrote:
I have reproduced the structure in MEEP and run the simulation. My
far-field spectra has some similar features but doesn’t particularly
match otherwise. I think it might be up to a normalization issue. Thus
I was wondering how to properly normalize the far-field for different
wavelengths when using a broadband source.
Normalization of the far fields will typically involve the same
procedure used to compute the reflectance/transmittance
<https://meep.readthedocs.io/en/latest/Python_Tutorials/Basics/#transmittance-spectrum-of-a-waveguide-bend>,
i.e.: (1) in an empty cell with just your sources, compute the near
fields and save the data using get_near2far_data
<https://meep.readthedocs.io/en/latest/Python_User_Interface/#near-to-far-field-spectra>
(or save_near2far), then (2) with your structure, compute the near
fields but invoke load_minus_near2far_data (or load_minus_near2far)
prior to time stepping. You then divide the far fields from (2) by those
in (1) to obtain a fractional value less than unity. Note that we
recently added support for periodic boundaries (#769
<https://github.com/NanoComp/meep/pull/769>).
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