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Why the result is not correct when sweeping freqency?
Q&A|Closed | Responses: 4
when I simulate a periodic nanostructure, the result is not correct when i sweep the freqency using a 'for' loop. In the result, it seems like the error is so...
https://nanohub.org/answers/question/2533
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TiO2 layer over the sides of a grating period
Q&A|Closed | Responses: 2
Hello,
I have reproduced some simple simulation with gratings using this software and all of them gave the exact answer I wanted. But when I am trying to do a...
https://nanohub.org/answers/question/2509
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Are there any flags that could be used to alter (i.e. improve) the convergence rate
Q&A|Closed | Responses: 1
We are experiencing slow convergence in that 216, 432 and then 864 Fourier modes' results are still changing slightly. 1728 modes would not run in a practical amount of time. Are there any...
https://nanohub.org/answers/question/2177
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Is there an example that uses a DBR stack?
Q&A|Closed | Responses: 0
Becoming acquainted with this software, I've tried to verify it's calculations using a distributed Bragg reflector geometry. However, I am not able to get the calculations to match...
https://nanohub.org/answers/question/1611
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why the materials can’t be defined as anisotropy material
Q&A|Closed | Responses: 1
in s4 ,the materials can be off-diagonal term, epsilon_xy , this can be used if P_MOKE calculation, but in this tools in this web, material is isotropy.
i look forward to the...
https://nanohub.org/answers/question/1560
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Why do grating periods< 1 result in a strange permittivity profile?
Q&A|Closed | Responses: 1
Hi,
when I try to simulate a lamellar grating with period < 0, the function GetEpsilon gives out some unexpected values. Is there anything that needs to be considered when...
https://nanohub.org/answers/question/1469
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2D Grating with periods < 1 give a strange permittivity
Q&A|Closed | Responses: 1
Hi,
I am just tryling to use S4 for a simple lamellar grating analysis. When I fix the period to values < 1, the calculated permittivity looks really strange. Is there any...
https://nanohub.org/answers/question/1468
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How to select polarization of the incident wave?
Q&A|Closed | Responses: 0
I want to make incident TM or p-polarized wave onto a substrate which is 1D grating. I selected |E_s|=0 and |E_p| = 1. But the output is not at all changing with change in...
https://nanohub.org/answers/question/1456
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what is the difference between AddLayer(‘slab’) and A
Q&A|Closed | Responses: 0
In the controll file, what is is the difference between AddLayer('slab') and AddLayer('layer')? Should they be the same?
Most of the examples use Add('slab') to...
https://nanohub.org/answers/question/1440
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How does S4 rescale the unit in the control file?
Q&A|Closed | Responses: 1
How do we rescale the unit in the control file? I notice the S4 will rescale the first wavelength to 0.9 in the control file.
Should we do the same thing if we code our control...
https://nanohub.org/answers/question/1433
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Can S4 be used to simulate vertical tapering nanowire arrays by divide the arrays into different levels?
Q&A|Closed | Responses: 1
I try to simulate the optical reflectance of vertical tapering nanowire arrays(nanowires have smaller top diameter and larger bottom diameter ). I divide the arrays into several levels(Each...
https://nanohub.org/answers/question/1432
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Why is there a discrepancy between the control file interface and the GUI?
Q&A|Closed | Responses: 0
I am simulating a 1D grating with a square wave pattern. I started with the GUI and received a decent result. However, when I downloaded the associated Control File and tried to use it in the S4...
https://nanohub.org/answers/question/1389
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How can I define the thickness of each layer in S4?
Q&A|Closed | Responses: 1
https://nanohub.org/answers/question/1354
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What does lattice vector means in the S4 simulation set up?
Q&A|Open | Responses: 1
While setting up the simulation in S4 solver, under the “layers“tab there is a field where the co ordinates for the lattice vector are to be filled.
What does it means ?
https://nanohub.org/answers/question/1344