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Question #1:
About converting files from v.6.0 to v.6.1
more...
Question #2:
About transmitted orders
more...
Question #3:
About a multi-layer lamellar grating
more...
 
Question #1:  
 
When using the v.6.1 program version, I could not as yet load/run the profiles (input *.grt files) and projects (output *.pcg files) generated by the PCGrate v. 6.0. When I attempt to do so the message "PCG Kernel ERROR: Value out of range" appears. How can I convert those files?  
 
Answer:  
 
The PCGrate v. 6.0 and v. 6.1 series are separate programs. You can run botháv. 6.0 and 6.1 software on your PC, but there is no way to convert the earlier files of any type into the new formats. We did that deliberately because a lot of changes and additions were made in the new 6.1 version. In going to the new 6.1 version you should reloadáyour important input profiles manually and save the earlier output data as .xls or .txt format files.  
 
IMPORTANT NOTE:  
 
You can also have the earlier PCGrate«-S(X) v. 6.0 software and the PCGrate«-S(X) v. 6.1 software installed on the same machine, but it is strongly recommended not to run different versions simultaneously.  
 
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Question #2:  
 
I am trying to calculate the simplest kind of transmission grating, namely, a lamellar grating having a substrate with a real index of 1.5 and zero imaginary index. I think I installed everything properly (it really seems very straightforward owing to the very simple user interface), but I cannot get any transmitted orders. I got 10 percent of the energy reflected, which is probably right, but I cannot view or plot the reflected orders.  
 
Answer:  
 
For efficiency calculation of transmitted orders, you should use only the "Resonance Calculation mode" andá"Finite Type of low border conductivity" options in the General/Accuracy optimization bookmark. If you would like to determine efficiency of the reflected orders of a transmission grating, you can also use the "Normal" calculating mode and the "Finite" type of conductivity for the substrate.  
 
IMPORTANT NOTE:  
 
If you change one "Calculation mode" for another, all parameters of the grating except the scanning parameters will be set to their default values. Therefore, with change of "Calculation mode" you will see a confirmation window.  
 
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Question #3:  
 
The example I have sent (see Figure #28) is a lamellar grating and on top of it there is a layer of material. Thus, when I look at the grating profile, I see a series of rectangular ridges with a layer on top of each of them. The layer of the coating material is actually rectangular as well, so that we have two rectangular profiles arranged one above the other. How can I proceed using the PCGrate?  
 
Answer:  
 
Attached here is an example of such a grating design and efficiency modelling by the PCGrate-S(X) v.6.1 software (see PCGrates_FAQ_A.zip). When constructing these lamellar border profiles, we used the "Trapezoidal Function of border profile" type with close to vertical slopes (but not equal exactly to 90 deg.) and small values of the "Vertical shift between borders" parameter for each layer (see Figure #29).  
 
IMPORTANT NOTE:  
 
There is an approximate relationship between minimal values of the "Accuracy parameter" Nk for border # k and big ratios of the "Period" to the "Minimal metric thickness between (adjacent) borders" d/T to reach an acceptable convergence of efficiency results, viz., υNk, min = d/T, where υ is a coefficient which is approximately equal to one or an integer greater than one.  
 
 
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