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We study the interaction of electromagnetic (EM) radiation with single-layergraphene and a stack of parallel graphene sheets at arbitrary angles ofincidence. It is found that the behavior is qualitatively different fortransverse magnetic (or p-polarized) and transverse electric (or s-polarized)waves. In particular, the absorbance of single-layer graphene attains minimum(maximum) for p (s) polarization, at the angle of total internal reflectionwhen the light comes from a medium with a higher dielectric constant. In thecase of equal dielectric constants of the media above and beneath graphene, forgrazing incidence graphene is almost 100% transparent to p-polarized waves andacts as a tunable mirror for the s-polarization. These effects are enhanced forthe stack of graphene sheets, so the system can work as a broad band polarizer.It is shown further that a periodic stack of graphene layers has the propertiesof an one-dimensional photonic crystal, with gaps (or stop--bands) at certainfrequencies. When an incident EM wave is reflected from this photonic crystal,the tunability of the graphene conductivity renders the possibility ofcontrolling the gaps, and the structure can operate as a tunablespectral--selective mirror.

Unusual reflection of electromagnetic radiation from a stack of graphene layers at oblique incidence