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<p>Cost-effective terahertz (THz) materials are in high demand due to increasing technological applications. In this study, high-quality single crystals of 2-amino-5-nitropyridinium chloride were successfully grown using the slow evaporation solution technique over a period of 10&#xa0;days, followed by multiple recrystallizations to enhance the purity and crystal quality. Structural analysis using X-ray diffraction and Rietveld refinement confirmed the monoclinic crystal structure with space group P2<sub>1</sub>. Fourier transformed infrared (FTIR) spectroscopy was employed to identify the functional groups present in the material. Optical studies revealed that the crystals exhibit excellent transparency in the wavelength range of 420–1100&#xa0;nm, with a transmittance of up to 99%. Differential scanning calorimetry (DSC) was used to determine the melting point of the crystals. Terahertz time-domain spectroscopy (THz-TDS) demonstrated the material’s interaction with THz radiation, showing distinct changes in the THz pulse profile upon transmission through the crystal. Furthermore, THz generation studies revealed that the crystals can generate peak THz electric field amplitude approximately one-third that of the reference material Zinc Telluride.</p>

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Comprehensive Terahertz Studies on Semi-organic 2-Amino-5-Nitropyridinium Chloride Crystal: Terahertz Generation and Birefringence

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Simran Agarwal,
  • Anurag Kumar Singh,
  • Atheena Pramod,
  • Fathimath Faseela,
  • Vibhavari Parkar,
  • Snehal Haldankar,
  • Utkarsh Pandey,
  • Ruturaj Puranaik,
  • Shriganesh Prabhu,
  • Nagalakshmi R.

摘要

Cost-effective terahertz (THz) materials are in high demand due to increasing technological applications. In this study, high-quality single crystals of 2-amino-5-nitropyridinium chloride were successfully grown using the slow evaporation solution technique over a period of 10 days, followed by multiple recrystallizations to enhance the purity and crystal quality. Structural analysis using X-ray diffraction and Rietveld refinement confirmed the monoclinic crystal structure with space group P21. Fourier transformed infrared (FTIR) spectroscopy was employed to identify the functional groups present in the material. Optical studies revealed that the crystals exhibit excellent transparency in the wavelength range of 420–1100 nm, with a transmittance of up to 99%. Differential scanning calorimetry (DSC) was used to determine the melting point of the crystals. Terahertz time-domain spectroscopy (THz-TDS) demonstrated the material’s interaction with THz radiation, showing distinct changes in the THz pulse profile upon transmission through the crystal. Furthermore, THz generation studies revealed that the crystals can generate peak THz electric field amplitude approximately one-third that of the reference material Zinc Telluride.