A photonic crystal-based broadband graphene saturable absorber

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...

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Bibliographic Details
Published in:arXiv.org 2018-12
Main Authors: Shen, Caoran, Zhang, Saifeng, Kislyakov, Ivan M, Dong, Ningning, Ryzhov, Anton A, Zhang, Xiaoyan, Belousova, Inna M, Nunzi, Jean-Michel, Wang, Jun
Format: Article
Language:English
Subjects:
Absorptivity
Broadband
Doppler effect
Graphene
Laser mode locking
Nonlinear response
Photonic crystals
Polymer matrix composites
Quantum theory
Spin coating
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1808.07668