
1.Laboratoire Interdisciplinaire Carnot de Bourgogne, Université Bourgogne Franche-Comté, 9 avenue Alain Savary, 21078 Dijon, France
2.Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, 18 Shilongshan Road, 310024 Hangzhou, Zhejiang Province, China
3.Institute of Advanced Technology, Westlake Institute for Advanced Study, 18 Shilongshan Road, 310024 Hangzhou, Zhejiang Province, China
4.Department of Electrotechnology, Federal Institute of Bahia, R. Emídio dos Santos, 40301015 Salvador, Brazil
Benoit Cluzel (benoit.cluzel@u-bourgogne.fr)
Published:2020,
Published Online:31 March 2020,
Received:16 September 2019,
Revised:02 March 2020,
Accepted:13 March 2020
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Wang, J. Y. et al. Saturable plasmonic metasurfaces for laser mode locking. Light: Science & Applications, 9, 448-456 (2020).
Wang, J. Y. et al. Saturable plasmonic metasurfaces for laser mode locking. Light: Science & Applications, 9, 448-456 (2020). DOI: 10.1038/s41377-020-0291-2.
Metamaterials are artificial materials made of subwavelength elementary cells that give rise to unexpected wave properties that do not exist naturally. However
these properties are generally achieved due to 3D patterning
which is hardly feasible at short wavelengths in the visible and near-infrared regions targeted by most photonic applications. To overcome this limitation
metasurfaces
which are the 2D counterparts of metamaterials
have emerged as promising platforms that are compatible with planar nanotechnologies and thus mass production
which platforms the properties of a metamaterial into a 2D sheet. In the linear regime
wavefront manipulation for lensing
holography
and polarization control has been achieved recently. Interest in metasurfaces operating in the nonlinear regime has also increased due to the ability of metasurfaces to efficiently convert incident light into harmonic frequencies with unusual polarization properties. However
to date
the nonlinear absorption of metasurfaces has been mostly ignored. Here
we demonstrate that plasmonic metasurfaces behave as saturable absorbers with modulation performances superior to the modulation performance of other 2D materials and exhibit unusual polarimetric nonlinear transfer functions. We quantify the link between saturable absorption
the plasmonic resonances of the unit cell and their distribution in a 2D metasurface
and finally provide a practical implementation by integrating the metasurfaces into a fiber laser cavity operating in pulsed regimes driven by the metasurface properties. As such
this work provides new perspectives on ultrathin nonlinear saturable absorbers for applications where tunable nonlinear transfer functions are needed
such as in ultrafast lasers or neuromorphic circuits.
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