Interface second harmonic generation enhancement in bulk WS<sub>2</sub>/MoS<sub>2</sub> hetero-bilayer van der Waals nanoantennas

Andrea Tognazzi; Paolo Franceschini; Jonas Biechteler; Enrico Baù; Alfonso Carmelo Cino; Andreas Tittl; Costantino De Angelis; Luca Sortino

doi:10.1038/s41377-025-01983-y

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Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas

Original Articles

- Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas
- Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas
- Light: Science & Applications 2025年14卷第11期页码：3594-3601
- Affiliations：
  
  1.Department of Engineering, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy
  2.National Institute of Optics - National Research Council (INO-CNR), Via Branze 45, 25123 Brescia, Italy
  3.Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
  4.Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
- Author bio：
  
  Andrea Tognazzi (andrea.tognazzi@unipa.it)
  Paolo Franceschini (paolo.franceschini@unibs.it)
  Luca Sortino (luca.sortino@physik.uni-muenchen.de)
- Funds：
- DOI：10.1038/s41377-025-01983-y
  中图分类号：
- 收稿：2024-11-07，
  
  修回：2025-07-07，
  
  录用：2025-07-23，
  
  网络出版：2025-09-29，
  
  纸质出版：2025-11-30
- Accepted：
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Andrea Tognazzi, Paolo Franceschini, Jonas Biechteler, 等. Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas[J]. Light: Science & Applications, 2025,14(11):3594-3601.

Tognazzi, A. et al. Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas. Light: Science & Applications, 14, 3594-3601 (2025).
Andrea Tognazzi, Paolo Franceschini, Jonas Biechteler, 等. Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas[J]. Light: Science & Applications, 2025,14(11):3594-3601. DOI： 10.1038/s41377-025-01983-y.

Tognazzi, A. et al. Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas. Light: Science & Applications, 14, 3594-3601 (2025). DOI： 10.1038/s41377-025-01983-y.

摘要

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

although monolayers of transition metal dichalcogenides exhibit giant second-order nonlinear responses

their bulk counterparts with 2H stacking possess zero second-order nonlinearity. In this work

we investigate 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-driven field enhancement. When both conditions are met

we observe up to 10

SHG signal enhancement

compared to unstructured bilayers

with SHG conversion efficiency reaching ≈ 10

−7

. 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.

关键词

Keywords

references

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Interface second harmonic generation enhancement in bulk WS2/MoS2 hetero-bilayer van der Waals nanoantennas

Interface second harmonic generation enhancement in bulk WS2/MoS2 hetero-bilayer van der Waals nanoantennas

DOI：10.1038/s41377-025-01983-y

摘要

Abstract

关键词

Keywords

references

Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas

Interface second harmonic generation enhancement in bulk WS₂/MoS₂ hetero-bilayer van der Waals nanoantennas