We design and fabricate a metasurface composed of gold cut-disk resonators that exhibits a strong coherent nonlinear response. We experimentally demonstrate all-optical modulation of both second- and third-harmonic signals on a subpicosecond time scale. Pump-probe experiments and numerical models show that the observed effects are due to the ultrafast response of the electronic excitations in the metal under external illumination. These effects pave the way for the development of novel active nonlinear metasurfaces with controllable and switchable coherent nonlinear response. © 2016 American Chemical Society.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Jun 6 2016|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported, in part, by EPSRC (UK) and the ERC iPLASMM project (321268). J.Z. was supported by the Royal Society Newton International Fellowship. A.Z. acknowledges support from the Royal Society and the Wolfson Foundation. G.W. acknowledges the support from the EC FP7 Project No. 304179 (Marie Curie Actions). Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. All data supporting this research are provided in full in the Results section.