Photonic-crystal-based broadband graphene saturable absorber

Saifeng Zhang, Caoran Shen, Ivan M. Kislyakov, Ningning Dong, Anton Ryzhov, Xiaoyan Zhang, Inna M. Belousova, Jean-Michel Nunzi, Jun Wang
2019 Optics Letters  
The enhanced saturable absorption (SA) of a onedimensional (1D) photonic crystal (PC) made from polymers and graphene composites by spin-coating is observed. 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 βeff for graphene nanoflakes embedded in the PC, when compared with the bulk graphene-polymer composite. The effect is studied in a wide range
more » ... laser intensities. Graphene inclusion into a 1D-PC remarkably decreases the SA-threshold and the saturation intensity, providing a desired solution for an advanced all-optical laser modelocking device.
doi:10.1364/ol.44.004785 fatcat:nhnsx5oxozbcne773bbxleknhu