- This topic has 5 replies, 2 voices, and was last updated 9 years, 2 months ago by Damian Marek.
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September 16, 2015 at 6:46 am #24809Ma PoParticipant
I want to calculate the (near) 0-th order far field Transmission Spectrum T(lambda) of a diffracting structure (periodic in x and z direction).
As I see I can calculate the fields in an output plane in near filed and normalize on the input plane in order to get T spectra here.
Also I can transform the into far field, but only for one wavelength at a time.Is there a possibility (or script) to get many wavelength’s far field data ?
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September 16, 2015 at 8:30 am #24815Ma PoParticipant
here is my basic model (OptiFDTD 32bit version):
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September 17, 2015 at 11:31 am #24876Damian MarekParticipant
I would start with this tutorial:
Diffraction Efficiency and Diffraction Angle Based on Grating Unit Cell
Also from a glance at your simulation I found that your Input plane and detectors were not placed optimally 🙂
When using PML boundaries you should try to keep the input plane and detectors away from the boundaries as this is where the field is being absorbed and will affect the accuracy of the simulations. Try keeping them about half the wavelength away and that should be sufficient.
Regards,
Damian -
September 18, 2015 at 3:44 am #24896Ma PoParticipant
Thanks Damian,
for checking my model and your comments on the planes distance from the PML boundaries.If I understand the example correctly, there is no way for doing the far field calculation for many wavelengths
in ONE action (or via a script) ?Regards,
Markusp.s. as I am using the 32 bit version – could you give me the 32bit version of mentioned example *Caululate_Grating_Efficiency.fdt ?
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September 18, 2015 at 4:54 am #24897Ma PoParticipant
for clarity, here the total experimental setup.
Aim is to simulate the spectrometer (400-1000nm) measured
transmission spectrum, normalized on input intensities. -
September 21, 2015 at 9:58 am #25064Damian MarekParticipant
There is no way to do the automatic far field transform for multiple wavelengths. Unfortunately you have to export each field individually and do the calculation manually. The example file I attached should also be in your samples folder with the same name.
Sorry for the slow response!
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