Open AccessSecond harmonic generation in monolithic lithium niobate metasurfaces
Author(s) -
Luca Carletti,
Cheng Li,
Jürgen Sautter,
Isabelle Staude,
Costantino De Angelis,
Tao Li,
Dragomir N. Neshev
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.033391
Subject(s) - lithium niobate , materials science , optics , second harmonic generation , optoelectronics , nonlinear optics , nonlinear system , sum frequency generation , semiconductor , substrate (aquarium) , high harmonic generation , laser , physics , oceanography , quantum mechanics , geology
Second-order nonlinear metasurfaces have proven their ability to efficiently convert the frequency of incident signals over subwavelength thickness. However, the availability of second-order nonlinear materials for such metasurfaces has so far been limited to III-V semiconductors, which have low transparency in the visible and impose constraints on the excitation geometries due to the lack of diagonal second-order susceptibility components. Here we propose a new design concept for second-order nonlinear metasurfaces on a monolithic substrate, which is not limited by the availability of thin crystalline films and can be applied to any non-centrosymmetric material. We exemplify this concept in a monolithic Lithium Niobate metasurface with cylinder-shaped corrugations for enhanced field confinement. By optimizing the geometrical parameters, we show enhanced second harmonic generation from a near-infrared pump beam with conversion efficiency above 10 -5 using 1 GW/cm 2 pump intensity. Our approach enables new opportunities for practical designs of generic metasurfaces for nonlinear and quantum light sources.