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Abstract
We experimentally investigate the polarization property of the specularly reflected light from an anodic porous alumina (APA) membrane coated with a gold (Au) thin film. As a result, we reveal a rapid change in the normalized Stokes parameter ${s_3}$ of the specularly reflected light around the angle of incidence ${\theta _{A}}$ at which the resonance absorption of the incident light occurs. The rapid change in ${s_3}$ demonstrates that the specularly reflected light can rapidly be right- to left-elliptically polarized via linear polarization at the zero-crossing point ${\theta _{Z}}$ of ${s_3}$. Moreover, ${\theta _{Z}}$ is located close to ${\theta _{A}}$, and ${\theta _{Z}}$ as well as ${\theta _{A}}$ depend on the occurrence conditions of the resonance absorption. From numerical aspects based on the Maxwell Garnett effective medium approximation, we clarify that the rapid change in ${s_3}$ accompanies the Fabry–Pérot (FP) resonance in the Au-coated APA membrane. The numerical results also suggest that the change in the refractive index of the filling material into nanopores of the Au-coated APA membrane can be successfully estimated by using the rapid change in ${s_3}$.
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