Learning Forum

[Chris Kopetski]

Hi

I would like to calculate the scattering and extinction spectra of my photonic crystal. Here is a screenshot of my file. Square array 1000nm period. I would like also to calculate the contribution from electric dipole as shown in this paper. How could I do in my structure…can anyone help me? thanks

Kuznetsov, A., Miroshnichenko, A., Fu, Y. et al. Magnetic light. Sci Rep 2, 492 (2012). https://doi.org/10.1038/srep00492

[Chris Kopetski]

Extinction and scattering spectra are usually used to characterize single standalone particles. Since your simulation file is simulating an array of particles instead of a single particle, you can use grating projections to characterize the directions that light is reflected and transmitted in, as well as the amount of light which propagates in each direction:
https://support.lumerical.com/hc/en-us/articles/360034394354
For the setup, I would recommend using the plane wave source and performing the grating calculations for the R and T monitors in your simulation file instead of using the TFSF source and the total and **** analysis groups. The setup is discussed in more detail here:
https://support.lumerical.com/hc/en-us/articles/360041688154
There are some examples of periodic structures like the one you are simulating in this section of our Knowledge Base:
https://support.lumerical.com/hc/en-us/articles/360043165334
If you would instead like to simulate a single particle and get the scattering due to that particle, the setup would be more similar to the examples here:
https://support.lumerical.com/hc/en-us/articles/360041688154
Hopefully one of these options is what you are looking for, but if anything is still unclear please let me know.