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Multiband enhanced second-harmonic generation via plasmon hybridization.

Shaoxin Shen1, Weimin Yang2, Jiejie Shan3

  • 1College of Information Science and Engineering, Fujian Provincial Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen 361021, People's Republic of China.

The Journal of Chemical Physics
|October 23, 2020
PubMed
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This summary is machine-generated.

Researchers developed a novel platform for enhanced nonlinear frequency conversion using hybrid metal-dielectric nanocavities. This design significantly boosts second-harmonic generation efficiency over a broad spectral range.

Area of Science:

  • * Nanophotonics
  • * Materials Science
  • * Nonlinear Optics

Background:

  • * Enhancing nonlinear frequency-conversion efficiency in hybrid nanostructures relies on optical field enhancement.
  • * Localized surface plasmons typically exhibit narrow spectral bandwidths, leading to signal degradation due to spectral mismatch.
  • * Efficient nonlinear signal generation requires overcoming spectral limitations in resonant modes.

Purpose of the Study:

  • * To design and demonstrate a multiband enhanced second-harmonic generation platform.
  • * To investigate the role of ZnO in modulating resonant modes and inducing plasmon hybridization.
  • * To achieve a coherent interplay between hybridized resonant modes and nonlinear dielectric susceptibilities.

Main Methods:

  • * Experimental design of three-dimensional metal-dielectric-metal nanocavities with ZnO films and silver mushroom arrays.

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  • * Modulation of fundamental-frequency-related resonant modes by varying geometric parameters.
  • * Inducing plasmon hybridization between localized and propagating surface plasmons.

    • Main Results:

    • * Introduction of ZnO enabled modulation of resonant modes and plasmon hybridization.
    • * ZnO served as an efficient nonlinear dielectric, facilitating multi-frequency nonlinear interactions.
    • * Achieved nearly two orders of magnitude increase in conversion efficiency compared to unpatterned systems over a 100-nm spectral range.

    Conclusions:

    • * Demonstrated a viable platform for multiband enhanced second-harmonic generation.
    • * Showcased the potential of ZnO-integrated nanostructures for efficient nonlinear optics.
    • * Paved the way for developing hybrid plasmon-light coupling schemes in 3D nanostructures.