Figure 3.

Reflectance measurements and the transfer matrix theory compared. Experimentally obtained energy dependences of the observed reflectance spectrum minima as a function of the angle of incidence (black dots). Calculated reflectance coefficients as a function of the excitation energy and the angle of incidence for 1 mg (a), 2 mg (b), 3 mg (c), and 4 mg (d) samples. Red line is the measured absorbance from the corresponding reference sample without silver as a function of excitation energy (scale on the top axis).