Enhanced magnetic second-harmonic generation in an ultra-compact plasmonic nanocavity

Yaorong Wang; Ilya Razdolski; Shixuan Zhao; Fan Yang; Xiu Liang; Yuri Kivshar; Dangyuan Lei

doi:10.1038/s41377-025-01962-3

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Enhanced magnetic second-harmonic generation in an ultra-compact plasmonic nanocavity

Original Articles

- Enhanced magnetic second-harmonic generation in an ultra-compact plasmonic nanocavity
- Light: Science & Applications Vol. 14, Issue 10, Pages: 3216-3225(2025)
- Affiliations：
  
  1.Department of Materials Science and Engineering, Centre for Functional Photonics, and Hong Kong Branch of National Precious Metals Material Engineering Research Centre, City University of Hong Kong, Hong Kong, China
  2.Department of Physics, City University of Hong Kong, Hong Kong, China
  3.College of Physics and Key Laboratory of High Energy Density Physics and Technology of the Ministry of Education, Sichuan University, Chengdu, Sichuan, China
  4.Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, China
  5.Nonlinear Physics Centre, Research School of Physics, Australian National University, Canberra, Australia
- Author bio：
  
  Dangyuan Lei (dangylei@cityu.edu.hk)
- Funds：
- DOI：10.1038/s41377-025-01962-3
  CLC：
- Received：13 March 2025，
  
  Revised：2025-06-10，
  
  Accepted：10 July 2025，
  
  Published Online：05 September 2025，
  
  Published：31 October 2025
- Accepted：
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Wang, Y. R. et al. Enhanced magnetic second-harmonic generation in an ultra-compact plasmonic nanocavity. Light: Science & Applications, 14, 3216-3225 (2025).
DOI：

Wang, Y. R. et al. Enhanced magnetic second-harmonic generation in an ultra-compact plasmonic nanocavity. Light: Science & Applications, 14, 3216-3225 (2025). DOI： 10.1038/s41377-025-01962-3.

摘要

Abstract

Observation of the second-harmonic generation (SHG) from subwavelength metallic structures is often hindered by the interrelations of higher-order multipolar contributions. In particular

the magnetic Lorentz contribution to SHG is often neglected due to the ineffective magnetic field enhancement in electrically resonant structures. Here

we demonstrate a strong Lorentz-driven SHG output at the plasmon-induced magnetic dipolar resonance in inversion-symmetry-broken plasmonic nanocavities. We observe experimentally tenfold enhancement in the SHG intensity when the magnetic dipole mode is excited

with polarization-resolved measurements confirming the significant role of the hydrodynamic Lorentz-driven second-order nonlinear response. The enhancement originates from a significant spatial overlap between the electric and magnetic fields within the nanometer-scale cavity gaps. Our findings outline the critical role played by the resonant Lorentz-driven optically induced magnetic nonlinearities in metallic nanocavities

and it paves the way towards developing highly efficient nanoscale nonlinear photonic devices.

关键词

Keywords

references

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