Dear @nahal

I will try to explain the parameters. You can finda description of the parameter by clicking here and then selecting methodology from the left hand side toolbar and choosing **Quantities to calculate from FDTD simulation**. For ease of access I copied a portion of the code that is the main focus of my response:

`_line52:_ g_silver100=pinch(absp_metal(1:nf,1,1))/absp_bare(1:nf); # for silver sphere ... _line84_: IQE_bare = integrate(prod_bare,1,wl1); ... _line93_: IQE_silver100 = integrate(wl1*spline(qe0_silver100,wl_qe0,wl1)*ssp1,1,wl1); # for silver sphere ... _line98_: G_silver100 = IQE_silver100/IQE_bare;`

Without going into the details of the script (which is out of the scope of this topic), *g-silver100* calculates the enhancement in absorbed power compared to bare silicon with no nano metals. This enhancement factor is a function of wavelength, and for example has a peak of 1.25 at \lambda=0.46.

IQE is described as:

as you can see from the link I provided earlier. As you probably already noticed, *IQE_bare* and *IQE_silver100* are not normalised here. Here we calculate only the numerator of IQE as the focus of the example was to calculate the enhancement in IQE when you are adding the metal particles. Basically *G-silver100* gives you the enhancement in quantum efficiency when you add the nano-particles.

To summarise, in order, to calculate the quantum efficiency for this system, you need to normalise it. Just an initial guess might be to use this line of code:

`IQE_norm = integrate(wl1*spline(qe0_silver100,wl_qe0,wl1)*ssp1,1,wl1)/integrate(wl1*ssp1,1,wl1);`

I hope that this clarifies the script that we used.