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<p>This article presents a comprehensive investigation into structural, optical, and nonlinear optical (NLO) responses of N-Phenyl Anthranilic Acid (NPAA) single crystals subjected to controlled shock wave treatments. High-quality NPAA crystals were synthesized using a mixed solvent slow evaporation method and subsequently exposed to multiple shock pulses generated via a tabletop shock tube. A series of advanced characterization techniques including Powder X-ray Diffraction (PXRD), High-Resolution X-ray Diffraction (HRXRD), UV-Vis spectroscopy, Photoluminescence (PL) spectroscopy, and Z-scan analysis were employed to study the impact of shock exposure. PXRD and HRXRD results revealed progressive recrystallization, grain boundary reduction, and improved crystallinity with increasing shock pulses. UV-Vis and PL analyses showed a significant enhancement in optical transmittance and emission intensity, indicating the reduction of defect densities and better structural ordering. Furthermore, Z-scan measurements demonstrated an increase in third-order NLO coefficients (<i>β</i> and <i>η</i><sub><i>2</i></sub>) after shock treatment, confirming an enhancement in self-focusing behavior of crystal. These findings establish shock wave processing as a viable post-growth method for tuning the optical and NLO properties of organic crystals, positioning NPAA as a promising candidate for applications in photonics, ultrafast lasers, and nonlinear optical devices.</p>

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Tailoring the linear and nonlinear optical properties of N-Phenyl anthranilic acid single crystals via post-growth mechanical shock treatment

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Vinod,
  • Sachin Yadav,
  • Ajay,
  • Kaphi,
  • N. Vijayan,
  • Anuj Krishna

摘要

This article presents a comprehensive investigation into structural, optical, and nonlinear optical (NLO) responses of N-Phenyl Anthranilic Acid (NPAA) single crystals subjected to controlled shock wave treatments. High-quality NPAA crystals were synthesized using a mixed solvent slow evaporation method and subsequently exposed to multiple shock pulses generated via a tabletop shock tube. A series of advanced characterization techniques including Powder X-ray Diffraction (PXRD), High-Resolution X-ray Diffraction (HRXRD), UV-Vis spectroscopy, Photoluminescence (PL) spectroscopy, and Z-scan analysis were employed to study the impact of shock exposure. PXRD and HRXRD results revealed progressive recrystallization, grain boundary reduction, and improved crystallinity with increasing shock pulses. UV-Vis and PL analyses showed a significant enhancement in optical transmittance and emission intensity, indicating the reduction of defect densities and better structural ordering. Furthermore, Z-scan measurements demonstrated an increase in third-order NLO coefficients (β and η2) after shock treatment, confirming an enhancement in self-focusing behavior of crystal. These findings establish shock wave processing as a viable post-growth method for tuning the optical and NLO properties of organic crystals, positioning NPAA as a promising candidate for applications in photonics, ultrafast lasers, and nonlinear optical devices.