Figure 3

Reflection and absorption spectra of PMA. (a) Absorption spectrum of PMA with an Au layer of 20 nm thickness kept at 600 °C thermal annealing temperature. Insert image is the schematic drawing of optical measurement setup. (b) Absorption spectrum of PMAs with an Au layer in 20 nm thickness at different thermal annealing temperature. Insert images are the photographs for 500 °C, 600 °C, 700 °C, and 800 °C thermal annealing temperature, respectively. (c) Absorption spectra of PMAs with different Au thickness kept at 600 °C thermal annealing temperature. All optical measurements were measured at normal incidence.