Thanks very much for this example. I worked through it, and the accuracy of the FDTD calculation itself is very good when doing a consistent calculation with Mie Theory, even better than what is presented here. Actually the biggest discrepancy is in the fit of the silver material parameters. The default parameters give a very poor fit to the material parameters, but a Mie Calculation done with that poor fit gives very excellent agreement to the scattering efficiency even with the supposedly low resolution of this simulation. it is also possible to tweak the material parameter fit to get better agreement in absolute terms. A video on that would probably be a good idea
I would like to thank you million times for the nice videos. I would be highly appreciated if you could post a video on how to calculate the charge density and multipoles distribution for metallic nanoparticles, thx a lot.
An excellent tutorial for beginners. In fact, I have started with these two videos and building up. Could you also make videos on SPR, LSPR and LSPR coupling at the inter-particle nanogaps?
sorry, I cannot get the same result as you do 18:38, my transmission trend is peaked at 400nm--4e-8, I've checked the simulation again and again, could you please help me out what's wrong with my FDTD (2023R1)?
Thanks for the nice presentation. I have a question though. As the particle/sphere size (100 micron) is smaller than the wavelength (400 micron), Mie scattering should not be applicable here, which is applicable to the spheres of sizes comparable to the wavelength and larger spheres. But it seems like the FDTD results match well with the Mie calculation. Why is that? I appreciate your insight into this.
Mie theory is applicable for all particle sizes. When particles go down to the nanoscale (1-10nm), then you have to account for nonlocal/quantum effects. But this can be done by allowing longitudinal modes into the Mie theory calculation
I'd recommend looking into the Multipole theory which is covered well by Jackson's Electromagnetism (it's chapter 9.7 in the Third edition). You'll see that Mie theory is just an example of the Multipole Expansion which is valid for any scattering object in an otherwise homogeneous medium.
@@computationalnanophotonics9545 Thank you very much. Actually, I was confused by the Mie Scattering info provided in Wikipedia (en.wikipedia.org/wiki/Mie_scattering#cite_note-1), Para 1 and 2. Thanks again.
Hi, thanks for these amaizing videos. I have a problem to calculate the absorption cross section. the result of simulation not is the typical absortion cross section but rather a negative absorbance values with a hollow and its not a peak.
I am trying to plot scattering cross section vs wavelength for silicon nanosphere of radius 100nm. The result that I am getting out of the Ansys LUMERICAL FTDT looks similar but it is exactly not matching with the results that i already have. The altitude of the peaks do not match. Can you help me with this?
Dear Josh, the scattering spectrum I got has a vale in the middle of the peak and not as round as the spectrum you got. I followed all your steps !! what went wrong?
Please upload more. You are really a great instructor 💙
It was cool to see magnetic dipoles in dielectrics! Thank you
thank you very much for making videos on FDTD. I am learning a lot from you. Keep making more videos.
Thanks very much for this example. I worked through it, and the accuracy of the FDTD calculation itself is very good when doing a consistent calculation with Mie Theory, even better than what is presented here. Actually the biggest discrepancy is in the fit of the silver material parameters. The default parameters give a very poor fit to the material parameters, but a Mie Calculation done with that poor fit gives very excellent agreement to the scattering efficiency even with the supposedly low resolution of this simulation. it is also possible to tweak the material parameter fit to get better agreement in absolute terms. A video on that would probably be a good idea
It's a perfect tutorial
I would like to thank you million times for the nice videos. I would be highly appreciated if you could post a video on how to calculate the charge density and multipoles distribution for metallic nanoparticles, thx a lot.
An excellent tutorial for beginners. In fact, I have started with these two videos and building up. Could you also make videos on SPR, LSPR and LSPR coupling at the inter-particle nanogaps?
tks for your instruct. very helpful for the beginner like me
Hi. Thanks for the presentation. Please can you make a video about Transmission through the component grating coupler.
Thanks Very much, It help me in good way.
Please make a video on Transmission through Quantum dots
amazing!! Thank you.
Amazing~!! Thank you so much.
sorry, I cannot get the same result as you do 18:38, my transmission trend is peaked at 400nm--4e-8, I've checked the simulation again and again, could you please help me out what's wrong with my FDTD (2023R1)?
Thanks for the nice presentation. I have a question though. As the particle/sphere size (100 micron) is smaller than the wavelength (400 micron), Mie scattering should not be applicable here, which is applicable to the spheres of sizes comparable to the wavelength and larger spheres. But it seems like the FDTD results match well with the Mie calculation. Why is that? I appreciate your insight into this.
Sorry, the unit would be nm instead of micron.
Mie theory is applicable for all particle sizes. When particles go down to the nanoscale (1-10nm), then you have to account for nonlocal/quantum effects. But this can be done by allowing longitudinal modes into the Mie theory calculation
I'd recommend looking into the Multipole theory which is covered well by Jackson's Electromagnetism (it's chapter 9.7 in the Third edition). You'll see that Mie theory is just an example of the Multipole Expansion which is valid for any scattering object in an otherwise homogeneous medium.
@@computationalnanophotonics9545 Thank you very much. Actually, I was confused by the Mie Scattering info provided in Wikipedia (en.wikipedia.org/wiki/Mie_scattering#cite_note-1), Para 1 and 2. Thanks again.
Thanks for this
Thank you so much❤️❤️❤️
Hi, thanks for these amaizing videos. I have a problem to calculate the absorption cross section. the result of simulation not is the typical absortion cross section but rather a negative absorbance values with a hollow and its not a peak.
A million likes for the video
how about the extinction cross-section , how can i do it? And thank you for this excellent tutorial
If I play the result through a monitor, I am not getting a result.
Please suggest me an appropriate answer!
How many frequency points do you use in the cross section analysis group?
I am trying to plot scattering cross section vs wavelength for silicon nanosphere of radius 100nm. The result that I am getting out of the Ansys LUMERICAL FTDT looks similar but it is exactly not matching with the results that i already have. The altitude of the peaks do not match. Can you help me with this?
Dear Josh, the scattering spectrum I got has a vale in the middle of the peak and not as round as the spectrum you got. I followed all your steps !! what went wrong?
just start from the beginning again(
i followed the same but it's not working on mine. what can i do?? what can i check?
Thanks very much ,can i have the PPT?
men, you are so grounded! thumbs up. if only you can share your email address or can i share mine here?
Can I have your powerpoint?