van der Waals forces enhanced light–graphene interaction in optical microfiber polarizer

A facile and efficient approach to manufacturing optical devices with a plane graphene-coupled microfiber structure is proposed—attaching the onto monolayer graphene-coated polydimethylsiloxane substrate. Such exhibit strong light–graphene interaction via evanescent fields of guided light in microfibers show evident polarization polarization-dependent saturable absorption effect. When graphene propagation distance 2.5 mm, diameter 3.9 μm, extinction ratio can reach up 31.0 dB wavelength at 1550 nm. The transmission TM modes could be increased continuously by increasing input power 980 3 10 modulation depths achieved nm pump 15.1 66.1 mW, respectively, which advantageous over unpolarized devices. proposed on efficiently integrate waveguides two-dimensional materials, great potential applications polarizers, all-optical modulators, mode-locked fiber lasers, sensors, especially for all-fiber systems.