A photonic crystal-based broadband graphene saturable absorber
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.
Cite
@article{arxiv.1808.07668,
title = {A photonic crystal-based broadband graphene saturable absorber},
author = {Caoran Shen and Saifeng Zhang and Ivan M. Kislyakov and Ningning Dong and Anton A. Ryzhov and Xiaoyan Zhang and Inna M. Belousova and Jean-Michel Nunzi and Jun Wang},
journal= {arXiv preprint arXiv:1808.07668},
year = {2019}
}
Comments
10 pages, 2 figures, 1 table