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<p>A novel organic NLO single crystal, 2A5GSSM, was successfully grown via the slow-evaporation method and exhibited a combination of exceptional structural, optical, and nonlinear properties. Single-crystal XRD confirmed its well-ordered orthorhombic structure, whereas FT–IR confirmed the proper coordination of the functional groups. The material shows excellent optical transparency with cutoff wavelengths of 256 nm and 349 nm, along with strong fluorescence emission, indicating its suitability for photonic applications. Mechanical analysis revealed high hardness and structural stability, and dielectric studies revealed consistent behavior across a wide frequency range. SEM images confirmed a smooth, defect-free morphology. Notably, the crystal exhibits a high laser damage threshold of 34.46 GW/cm<sup>2</sup>, surpassing KDP, and delivers superior SHG efficiency (1.56× higher than that of KH<sub>2</sub>PO<sub>4</sub>). Third-order NLO studies using the Z-scan technique show strong nonlinear absorption governed by two-photon and excited-state processes, supported by a high nonlinear absorption coefficient and a very low optical limiting threshold, establishing 2A5GSSM as a highly promising candidate for advanced optical limiting and photonic device applications.</p>

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Synthesis and multifaceted characterization of 2A5GSSM single crystals for advanced photonic applications

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • R. Natarajan,
  • B. Samuel Ebinezer,
  • M. Meena,
  • M. Shalini,
  • R. S. Sundararajan,
  • T. C. Sabari Girisun

摘要

A novel organic NLO single crystal, 2A5GSSM, was successfully grown via the slow-evaporation method and exhibited a combination of exceptional structural, optical, and nonlinear properties. Single-crystal XRD confirmed its well-ordered orthorhombic structure, whereas FT–IR confirmed the proper coordination of the functional groups. The material shows excellent optical transparency with cutoff wavelengths of 256 nm and 349 nm, along with strong fluorescence emission, indicating its suitability for photonic applications. Mechanical analysis revealed high hardness and structural stability, and dielectric studies revealed consistent behavior across a wide frequency range. SEM images confirmed a smooth, defect-free morphology. Notably, the crystal exhibits a high laser damage threshold of 34.46 GW/cm2, surpassing KDP, and delivers superior SHG efficiency (1.56× higher than that of KH2PO4). Third-order NLO studies using the Z-scan technique show strong nonlinear absorption governed by two-photon and excited-state processes, supported by a high nonlinear absorption coefficient and a very low optical limiting threshold, establishing 2A5GSSM as a highly promising candidate for advanced optical limiting and photonic device applications.