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Updated: May 13, 2026

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Reverse Weak Polarity-Induced Ordered Layer Control for Enhanced Second-Harmonic Generation in Ultraviolet Nonlinear

Lingli Wu1,2, Chensheng Lin1, Bing-Xuan Li1

  • 1State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 11, 2026
PubMed
Summary

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This summary is machine-generated.

Researchers developed a new strategy to align crystal layers, significantly boosting second-harmonic generation (SHG) for advanced ultraviolet laser technologies. This method ensures consistent layer stacking, enhancing nonlinear optical properties.

Area of Science:

  • Materials Science
  • Crystallography
  • Optics

Background:

  • Achieving high second-harmonic generation (SHG) is crucial for advancing ultraviolet nonlinear optical (UV NLO) technologies.
  • Layered materials offer potential for NLO applications due to preorganized π-conjugated units, but random stacking often limits SHG efficiency.
  • Existing interlayer linkers (metal cations) typically form non-directional ionic bonds, leading to antiparallel arrangements that cancel SHG signals.

Purpose of the Study:

  • To develop a novel strategy for controlling the alignment of polar layers in layered materials.
  • To engineer interlayer connectivity to enforce consistent polar layer stacking and maximize SHG response.
  • To synthesize and characterize new UV NLO materials exhibiting enhanced SHG performance.

Main Methods:

Keywords:
layered structurespolarity transfersecond harmonic generationultraviolet nonlinear optical crystal

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  • Proposed the Reverse Weak Polarity-Induced Ordered-layer Control (RPIO) strategy, utilizing dipole-dipole interactions for polarity transfer between layers.
  • Synthesized three isostructural compounds: RE(C3H2O4)NO3·4H2O (RE = Y, Gd, Lu) based on the RPIO strategy.
  • Characterized the synthesized compounds for their SHG response, band gaps, birefringence, and crystal growth habits.

Main Results:

  • Successfully synthesized isostructural compounds with coherently aligned polar [RE(C3H2O4)(H2O)4]+ layers linked by NO3-.
  • Observed large SHG responses in the synthesized materials, ranging from 8.5 to 9.5 times that of KDP.
  • Confirmed wide band gaps (approx. 4.13 eV), significant birefringence (approx. 0.135 at 589.3 nm), and favorable crystal growth.

Conclusions:

  • The RPIO strategy provides a predictable and controllable route to achieve ordered stacking of polar layers in layered UV NLO materials.
  • Engineered interlayer connectivity is key to maximizing SHG in these materials.
  • The synthesized compounds demonstrate significant potential for applications in UV laser technologies.