ABSTRACT

A polarizer is an optical filter that passes light of a specific polarization and blocks waves of other polarizations. Polarization is a common property of electromagnetic waves. If the electric vectors are all along the same plane, the light is polarized; otherwise, the light is unpolarized. All fiber in-line polarizer is one of the most important components in fiber-optic communication and sensor systems. Bao et al., successfully coupled broadband light into graphene film by transferring graphene grown with chemical vapor deposition onto a side-polished optical fiber to form a graphene-to-fiber coupler. The graphene-based TE polarizer can be switched into the TM mode if the graphene film is sufficiently doped to shift to chemical potential to a value larger than half excitation energy. In-line polarizers have come a long way since the 1980s. Various materials for in-line polarizers have been realized, such as gold nanoparticles, polymer, and graphene deposited on D-shaped fibers.