Dear Ahmed Mekawy, Many thanks for sharing your results with us. It is very useful, especially for me as for a beginner. My questions: - From viewpoint of particles with more complex shapes, the normalization should be done for the surface area of the particle, or for the area seen by the incident light (projection of particle shape to the plane which is perpendicular to the light propagation direction)? - How can I decompose the contribution of higher-order of multipoles (n>2, eg.: sextopulo, octupole, etc.)?
Hi Wasya87, Thanks. - Yes I agree (projection of particle shape ...). - For higher order multipoles, you can refer to dx.doi.org/10.1088/1367-2630/14/9/093033 However, I believe, for very high orders >4, the particle size will be much larger than the wavelength, so you can again apply approximate formulae.
@@ahmedmekawy1632 Hello can you please tell me how can we calculate the multipole decomposition and scattering cross-section when the nanostructures are periodically arranged?
Thanks for this awesome video! I was wondering how can we calculate the multipole decomposition and scattering cross-section when the nanostructures are periodically arranged? Like photonic-crystal?
Thanks for the nice and informative tutorial. I used the same equations for Si nano particle of customized size it was showing an error to define real and imaginary refractive indices. Marked by "n" and "k" in wave equation. How to fix it for imaginary part please?
@@ahmedmekawy1632 It says, define "n" and "ik" in "wave equation 1". So I wanna ask that should it be same as dielectric constant of my material? The second problem I am arising that I creates a lot of fine mesh which stuck-up the calculation. So how can I customize mesh size to increase computation time?
hello, tank you very match!! I have error when I evaluate final for Global evaluation I get this: Division by zero. - Function: / Failed to evaluate expression.
I'm getting an error in the global calculation and it says "wrong number of variables used to call the function", the function name is besselj, the number of variables used is 1, and the number of variables expected from is 2. I hope I can get your answer, thank you very much.
thank your so much for your contribution. I found here, value of scattering efficiency are different in paper and your calculation? can you explained it? thank you for your indeed help.
Hi Mander, please keep the definition as sqrt(pi/2/x)*besselj(n+0.5,x) in time 10:43. I got different result because I used wrong scaling, \sqrt(2/pi/x).
Thanks for the great video. Can I ask you how you dealt with the constants for each multipole components such as (-1/iw), (3/2), (-3/iw), 15 in table 2? Thanks.
Very nice videos, I am learning COMSOL and your tutorials are really nice. I would like to see examples of metallic waveguides and Surface Plasmons. I hope you keep posting videos of this kind.
This video was so helpful! I would love to see more content like this!
Dear Ahmed Mekawy,
Many thanks for sharing your results with us. It is very useful, especially for me as for a beginner. My questions:
- From viewpoint of particles with more complex shapes, the normalization should be done for the surface area of the particle, or for the area seen by the incident light (projection of particle shape to the plane which is perpendicular to the light propagation direction)?
- How can I decompose the contribution of higher-order of multipoles (n>2, eg.: sextopulo, octupole, etc.)?
Hi Wasya87, Thanks.
- Yes I agree (projection of particle shape ...).
- For higher order multipoles, you can refer to dx.doi.org/10.1088/1367-2630/14/9/093033
However, I believe, for very high orders >4, the particle size will be much larger than the wavelength, so you can again apply approximate formulae.
@@ahmedmekawy1632 Hello can you please tell me how can we calculate the multipole decomposition and scattering cross-section when the nanostructures are periodically arranged?
@@ahmedmekawy1632 this is also what i want to know! thanku
I'm so gratefull you. I needing it for my project
Dear Mr. Mekawy, could you please write me the expression for toroidal multipole moments?
Why -iw was not multiplied with electric dipole? The exact formula has -iw?
Thanks for this awesome video! I was wondering how can we calculate the multipole decomposition and scattering cross-section when the nanostructures are periodically arranged? Like photonic-crystal?
Same, let me know if you already know the answer!
Did you get any answer?
That's Great ,thaks a lot.
I searched to your FB account to contact with you for consulting but I haven't found it ,unfortunately.
thanks for your contribution , but if i use sphere then what is the value of jn , and where i need to modify your formula? please explain it.
good video, I have a question, do you know how to obtain multipole decomposition for anistropic materials?
Thanks for the nice and informative tutorial. I used the same equations for Si nano particle of customized size it was showing an error to define real and imaginary refractive indices. Marked by "n" and "k" in wave equation. How to fix it for imaginary part please?
Thanks. I hope you have found the answer already. If not, can you explain more?
@@ahmedmekawy1632 It says, define "n" and "ik" in "wave equation 1". So I wanna ask that should it be same as dielectric constant of my material? The second problem I am arising that I creates a lot of fine mesh which stuck-up the calculation. So how can I customize mesh size to increase computation time?
Assalamoalaikum
Hi
I need complete vedio without image ,which you are using during making vedio to hinde option
Can you please teach me How to manipulate and apply anapole modes on different structures? I am all new to Comsol.
It is such a great help! Thank you for saving my life!!!
Thx
hello, tank you very match!!
I have error when I evaluate final for Global evaluation
I get this:
Division by zero.
- Function: /
Failed to evaluate expression.
Thanks and jazakallah khair for uploading this video which I found very helpful
why didn't you use 2d axis sym. module for this task?
May allah bless you, it is great
Dear Ahmed, Thank you very much. It's very helpful and informative.
Thank you so much. that is amazing. very informative and helpful.
can you please help me with 3D solar cell simulations in COMSOL?
I'm getting an error in the global calculation and it says "wrong number of variables used to call the function", the function name is besselj, the number of variables used is 1, and the number of variables expected from is 2. I hope I can get your answer, thank you very much.
Please check all besselj function in the Exact formulae section "jn" they should have two arguments jn(n,a)
Thanks a lot!!! This is really helpful 🎉
thank your so much for your contribution. I found here, value of scattering efficiency are different in paper and your calculation? can you explained it? thank you for your indeed help.
Hi Mander, please keep the definition as sqrt(pi/2/x)*besselj(n+0.5,x) in time 10:43. I got different result because I used wrong scaling, \sqrt(2/pi/x).
Thanks for the great video. Can I ask you how you dealt with the constants for each multipole components such as (-1/iw), (3/2), (-3/iw), 15 in table 2? Thanks.
Hi. Canmove, what do you mean? sorry i do not understand
I have the same questions
Very nice videos, I am learning COMSOL and your tutorials are really nice. I would like to see examples of metallic waveguides and Surface Plasmons. I hope you keep posting videos of this kind.
Thank you. Sure thing, I put that on the list.
very thank U!
Awesome
How to do it for cube?
just replace the cylinder with a cube, update the areas and volume accordingly in the expressions.
It's really helpful video to say the least, but I want to ask you more questions can I please get your email thanks.