We know with total-field scattered-field (TFSF) source method both scattering and absorption cross-section of metal nanoparticles can be able to calculate.

In our work, we introduced Ag nanoparticle in an absorbing medium and it is essential to compare its scattering and absorption cross-section.

If the Ag NP is situated in non-absorbing media, we can easily calculate absorption cross-section of Ag NP using TFSF source method, as in the case of Mie 3D example.

However, when Ag NP is it in the absorbing medium, then the TFSF source method will give absorption cross-section of both Ag NP and absorbing medium together (Ag NP+absorbing medium).

**My question is how can we able to calculate absorption cross-section of Ag NP if it is situated in an absorbing medium?**

To get more idea about my question, please see the attached file.