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arXiv · 1808.07668

A photonic crystal-based broadband graphene saturable absorber

Caoran Shen·Saifeng Zhang·Ivan M. Kislyakov·Ningning Dong·Anton A. Ryzhov·Xiaoyan Zhang·Inna M. Belousova·Jean-Michel Nunzi·Jun Wang
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Abstract

The enhanced nonlinear optical response of a one-dimensional (1D) photonic crystal (PC) made from polymers and graphene composites is observed. The graphene PC was fabricated by spin-coating. It shows obvious bandgaps at two wavelengths in transmittance. Femtosecond Z-scan measurement at 515 nm and 1030 nm reveals a distinct enhancement in the effective nonlinear absorption coefficient Beff (and imaginary part of third-order dielectric susceptibility ImX(3)) for graphene nanoflakes embedded in the PC, when compared with the bulk graphene-polymer dispersion. The effect is studied in a wide range of laser intensities. The inclusion of graphene into a 1D-PC remarkably decreases the saturable absorption threshold and saturation intensity, providing a desired solution for an advanced all-optical laser mode-locking device.

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Caoran Shen, Saifeng Zhang, Ivan M. Kislyakov, Ningning Dong, Anton A. Ryzhov, Xiaoyan Zhang, Inna M. Belousova, Jean-Michel Nunzi, Jun Wang. 2018-12-19. A photonic crystal-based broadband graphene saturable absorber. https://doi.org/10.1364/ol.44.004785

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