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

Gauthier Roubaud, Pierre Bondareff, Giorgio Volpe, Sylvain Gigan, Sébastien Bidault & Samuel Grésillon

We demonstrate the local optimization of nonlinear luminescence from disordered gold metasurfaces by shaping the phase of a 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 sub-wavelength electric fields. In practice, the increase in nonlinear luminescence is strongly sensitive to both the nanometer-scale morphology and to the level of structural complexity of the gold metasurface. We typically observe a two-order 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.

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s