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Far-Field Wavefront Control of Nonlinear Luminescence in Disordered Gold Metasurfaces

Roubaud, G; Bondareff, P; Volpe, G; Gigan, S; Bidault, S; Grésillon, S; (2020) Far-Field Wavefront Control of Nonlinear Luminescence in Disordered Gold Metasurfaces. Nano Letters , 20 (5) pp. 3291-3298. 10.1021/acs.nanolett.0c00089. Green open access

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Abstract

We demonstrate the local optimization of nonlinear luminescence from disordered gold metasurfaces by shaping the phase of femtosecond excitation. This process is enabled by the far-field wavefront control of plasmonic modes delocalized over the sample surface, leading to a coherent enhancement of subwavelength electric fields. In practice, the increase in nonlinear luminescence is strongly sensitive to both the nanometer-scale morphology and the level of structural complexity of the gold metasurface. We typically observe a 2 orders of magnitude enhancement of the luminescence signal for an optimized excitation wavefront compared to a random one. These results demonstrate how disordered metasurfaces made of randomly coupled plasmonic resonators, together with wavefront shaping, provide numerous degrees of freedom to program locally optimized nonlinear responses and optical hotspots.

Type: Article
Title: Far-Field Wavefront Control of Nonlinear Luminescence in Disordered Gold Metasurfaces
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.nanolett.0c00089
Publisher version: https://doi.org/10.1021/acs.nanolett.0c00089
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Wavefront shaping, disordered media, metasurfaces, nonlinear luminescence, plasmonics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10094720
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