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Photonic-crystal-based broadband graphene saturable absorber.

Authors
  • Zhang, Saifeng
  • Shen, Caoran
  • Kislyakov, Ivan M
  • Dong, Ningning
  • Ryzhov, Anton
  • Zhang, Xiaoyan
  • Belousova, Inna M
  • Nunzi, Jean-Michel
  • Wang, Jun
Type
Published Article
Journal
Optics Letters
Publisher
The Optical Society
Publication Date
Oct 01, 2019
Volume
44
Issue
19
Pages
4785–4788
Identifiers
DOI: 10.1364/OL.44.004785
PMID: 31568442
Source
Medline
Language
English
License
Unknown

Abstract

The enhanced saturable absorption (SA) of a one-dimensional (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 of laser intensities. Graphene inclusion into a 1D PC remarkably decreases the SA threshold and saturation intensity, providing a desired solution for an advanced all-optical laser mode-locking device.

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