Control and characterization of disordered plasmonic metasurfaces by far-field wavefront shaping

Gauthier Roubaud; Sylvain Gigan; Samuel Grésillon; Sébastien Bidault

doi:10.1117/12.2620708

24 May 2022 Control and characterization of disordered plasmonic metasurfaces by far-field wavefront shaping

Gauthier Roubaud, Sylvain Gigan, Samuel Grésillon, Sébastien Bidault

Proceedings Volume PC12130, Metamaterials XIII; PC121300F (2022) https://doi.org/10.1117/12.2620708
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Plasmonic resonators featuring nanoscale can exhibit strongly enhanced optical near-fields that have been extensively used in surface enhanced spectroscopy (Raman and Fluorescence) and in biosensing. However, deterministic nanostructures do not provide numerous degrees of freedom to control optically these local field enhancements. By comparison, wavefront shaping techniques in disordered scattering media provide numerous degrees of freedom to control light focusing in space and time. To associate local field enhancements and far-field wavefront control, we use disordered plasmonic metasurfaces close to the percolation threshold that feature both hotspots and delocalized plasmonic modes that can be controlled using a spatial light modulator. By controlling the phase of an incoming femtosecond pulsed laser on a disordered gold metasurface, we optimize the two-photon induced luminescence (TPL) at a chosen position with a typical two-order of magnitude enhancement, indicating a far-field optimization of the optical near-field. The optimization process is performed using a random genetic algorithm and provides the highest enhancement when the metasurface features the highest degree of morphological complexity, close to the percolation threshold (Nano Lett. 20, 3291 (2020)). Far-field wavefront shaping also provides new degrees of freedom to provide statistical imaging schemes that offset the structural complexity of disordered nanophotonic systems. For instance, using nonlinear luminescence images measured with randomly wavefront-shaped femtosecond excitations, we can independently map the localized and delocalized plasmonic modes on a disordered gold metasurface (ACS Photonics 8, 1973 (2021)).

Conference Presentation

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Gauthier Roubaud, Sylvain Gigan, Samuel Grésillon, and Sébastien Bidault "Control and characterization of disordered plasmonic metasurfaces by far-field wavefront shaping", Proc. SPIE PC12130, Metamaterials XIII, PC121300F (24 May 2022); https://doi.org/10.1117/12.2620708

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KEYWORDS

Plasmonics

Wavefronts

Luminescence

Near field optics

Femtosecond phenomena

Gold

Imaging systems

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