Wavevector-Selective Nonlinear Plasmonic Metasurfaces
Artikel i vetenskaplig tidskrift, 2017

Electromagnetic metasurfaces with strong nonlinear responses and angular selectivity could offer many new avenues for designing ultrathin optics components. We investigated the optical second harmonic generation from plasmonic metasurfaces composed of aligned gold nanopillars with a pronounced out-of-plane tilt using a flexible nonlinear Fourier microscope. The experimental and computational results demonstrate that these samples function as wavevector-selective nonlinear metasurfaces, that is, the coherent second harmonic signal does not only depend on the polarization and wavelength of the excitation beam, but also of its direction of incidence, in spite of the subwavelength thickness of the active layer. Specifically, we observe that the nonlinear response can vary by almost two orders-of-magnitude when the incidence angle is changed from positive to negative values compared to the surface normal. Further, it is demonstrated that these metasurfaces act as a directional nonlinear mirrors, paving the way for new design of directional meta-mirrors in the nonlinear regime.

directionality

nonlinear optical material

second harmonic generation

nonlinear plasmonics

Metamaterials

Författare

Kuang Yu Yang

Ecole Polytechnique Federale de Lausanne

Ruggero Verre

Chalmers, Fysik, Bionanofotonik

Jérémy Butet

Ecole Polytechnique Federale de Lausanne

Chen Yan

Ecole Polytechnique Federale de Lausanne

Tomasz Antosiewicz

Chalmers, Fysik, Bionanofotonik

Mikael Käll

Chalmers, Fysik, Bionanofotonik

Olivier J.F. Martin

Ecole Polytechnique Federale de Lausanne

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 17 5258-5263

Ämneskategorier

Fysik

DOI

10.1021/acs.nanolett.7b01412