Table 1.

The values of the different parameters of the materials used in the calculations.

Layer	Porosity (%)	Thickness (µm)
First layer (PSi1, n1)	65	d1 = 0.5
Second layer (PSi2, n2)	77	d2 = 1.0
Third layer (PSi3, n3)	85	d3 = 1.0
Metal	Ag, Al, Au, and Pt	dm = 0.040