Interface second harmonic generation enhancement in hetero-bilayer van der Waals nanoantennas
arXiv:2411.06156 · doi:10.1038/s41377-025-01983-y
Abstract
Layered van der Waals (vdW) materials have emerged as a promising platform for nanophotonics due to large refractive indexes and giant optical anisotropy. Unlike conventional dielectrics and semiconductors, the absence of covalent bonds between layers allows for novel degrees of freedom in designing optically resonant nanophotonic structures down to the atomic scale, from the precise stacking of vertical heterostructures to controlling the twist angle between crystallographic axes. Specifically, while transition metal dichalcogenides monolayers exhibit giant second order nonlinear responses, their bulk counterparts with 2H stacking have zero second order response. In this work, we show second harmonic generation (SHG) arising from the interface of WS/MoS hetero-bilayer thin films with an additional SHG enhancement in nanostructured optical antennas mediated by both the excitonic resonances and the anapole condition. When both conditions are met, we observe up to SHG signal enhancement. Our results highlights vdW materials as a platform for designing unique multilayer optical nanostructures and metamaterial, paving the way for advanced applications in nanophotonics and nonlinear optics.
Manuscript + Supplementary (21 pages, 3 Main figures 8 supplementary figures)
References in corpus (24)
- 2D materials and van der Waals heterostructures
- Magnetic light
- Individual nanoantennas empowered by bound states in the continuum for nonlinear photonics
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
- Observation of Intense Second Harmonic Generation from MoS Atomic Crystals
- Cleaning Interfaces in Layered Materials Heterostructures
- Nonradiating Photonics with Resonant Dielectric Nanostructures
- Giant nonlinear response at the nanoscale driven by bound states in the continuum
- Applications of Bound States in the Continuum in Photonics
- Transition metal dichalcogenide nanodisks as high-index dielectric Mie nanoresonators
- Giant optical anisotropy in transition metal dichalcogenides for next-generation photonics
- Optical imaging of strain in two-dimensional crystals
- Strong light-matter interaction with self-hybridized bound states in the continuum in monolithic van der Waals metasurfaces
- Nonlinear twistoptics at symmetry-broken interfaces
- All-optical polarization and amplitude modulation of second-harmonic generation in atomically thin semiconductors
- Transition metal dichalcogenide metamaterials with atomic precision
- Asymmetric parametric generation of images with nonlinear dielectric metasurfaces
- Towards compact phase-matched and waveguided nonlinear optics in atomically layered semiconductors
- Quantum interference in second-harmonic generation from monolayer WSe2
- Multipolar interference effects in nanophotonics
- Van der Waals Materials for Applications in Nanophotonics
- Transition metal dichalcogenide dimer nano-antennas with ultra-small gaps
- Exciton Assisted Deeply Subwavelength Nano-Photonics
- Chiral photonic super-crystals based on helical van der Waals homostructures