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Anonymous

Exact size of object

Dear,

I know you have provided detailed guidance regarding this in manual but somehow i am missing something. there are few questions regarding exact size of the object

1. how can i know the exact size of the object (length, diameter) after converting it in DDA convert? i would like to simulate precise size of the object.

2. i would like to compare my simulation with literature where they define a rod with diameter 7.5 nm and length 25 nm and used 40000 dipoles. if i use option "total dipole volume" and set 40,000 dipoles and distance between the dipoles 1 nm, my object size become huge, how can I use 40,000 dipoles in abovementioned size?

3. in general can you please send me more detail/article where i can understand how to control the precise size of the object in the DDSCAT+, maybe some extra tips and tricks

i will be extremely thankful

regards

Shahid

 

 

With Kind Regards

________________________________

Muhammad Shahid Arshad

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    AbderRahman N Sobh

    Hi Shahid,

     

    You will have to do a little bit of calculation in any input type to DDAConvert in order to discover the object size. This is because we decided to allow nanoDDSCAT to be able to have a high amount of simulation precision by allowing the user to choose how many dipoles they want per nm and the spacing, otherwise we could use some defaults and just allow the user to enter in (nm).

     

    In short, to know the exact dimensions of the system we typically do the following:

     

    First, you will need to look at the 3D graphic of the dipoles and see how many dipoles span a nice straight edge (this will give you the ratio of the whole system).

     

    For example, if I have a rectangular prism that is 2x2x4 "Blender Units" when I draw it I can just measure how many dipoles are on the 4unit edge. Let's say I found there are 20 dipoles there. Then, I can divide the 20 dipoles by 4 and see that the ratio here is 5 dipoles per 1 "Blender Unit". So then, I can use this ratio on the rest of my shape to know that the dimensions are 10x10x20 Dipoles aka Points. 

     

    Note you can determine "Blender Units" by opening up your shape in the Blender 3D editor we provide and pressing the "N" key. This will open a panel that shows the shape's dimensions and some other details.

     

    Then, finally I will set the scaling parameter to make the actual size of the shape. If I set this value to 5 nm between dipoles, then my shape will be n dipoles times the conversion rate. So here I would get a 50x50x100nm shape.
     

    As a note, we are redesigning this input method since it is very confusing for users currently. We ask for your patience as we try to improve this tool.

     

    Hope this helps,

    AbderRahman N. Sobh

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