Growth, structural, thermal and THz generation properties of modified DAST, CMST and BMST crystals: A comparative study

IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Pramana Pub Date : 2024-05-28 DOI:10.1007/s12043-024-02753-y
S Shanmuga Sundari, D Ganesh, P Kanchana, N Arnadevi, A K Chaudhary, B Prabha Devi
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引用次数: 0

Abstract

Growth of 4-N-N-dimethylamino-4\(^\prime \)-N\(^\prime \)-methyl-stilbazolium tosylate (DAST), 4-chloro-N-methyl 4-stilbazolium tosylate (CMST) and 4-bromo-N-methyl 4-stilbazolium tosylate (BMST) crystals by slope nucleation technique using mixed solvents are reported. Investigation on compositional, structural, thermal, luminescent and dielectric properties of these crystals were studied. Purity and the crystal quality are analysed using NMR and XRD. The thermal stability of the crystals is studied in detail from the TG-DTA. Emission characteristics are examined by photoluminescence spectra. Finally, 800 nm wavelength of 140 and 50 fs duration of pulses obtained from Ti:sapphire oscillator and amplifier were used for the measurement of refractive indices and absorption coefficients and generation of terahertz (THz) radiation. The conversion efficiency of DAST, CMST and BMST with respect to incident laser power of 150 mW were of the order of \(0.67 \times 10^{-4}\), \(0.826\times 10^{-4}\) and \(0.947 \times 10^{-4}\), respectively. Finally, the significance of effective polarisability in THz generation has been demonstrated in terms of rotational angle \(\theta \).

Abstract Image

Abstract Image

改性 DAST、CMST 和 BMST 晶体的生长、结构、热和太赫兹生成特性:比较研究
报告了使用混合溶剂通过斜坡成核技术生长的 4-N-N-二甲氨基-4(^\prime \)-N(^\prime \)-甲基对甲苯磺酰苯巴唑鎓(DAST)、4-氯-N-甲基对甲苯磺酰苯巴唑鎓(CMST)和 4-溴-N-甲基对甲苯磺酰苯巴唑鎓(BMST)晶体。研究了这些晶体的组成、结构、热、发光和介电特性。使用 NMR 和 XRD 分析了晶体的纯度和质量。通过 TG-DTA 对晶体的热稳定性进行了详细研究。通过光致发光光谱研究了发射特性。最后,利用从钛蓝宝石振荡器和放大器获得的波长为 800 nm、持续时间为 140 和 50 fs 的脉冲来测量折射率和吸收系数,并产生太赫兹(THz)辐射。相对于150 mW的入射激光功率,DAST、CMST和BMST的转换效率分别为(0.67乘以10^{-4})、(0.826乘以10^{-4})和(0.947乘以10^{-4})。最后,用旋转角(\theta \)证明了有效极性在太赫兹产生中的重要性。
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来源期刊
Pramana
Pramana 物理-物理:综合
CiteScore
3.60
自引率
7.10%
发文量
206
审稿时长
3 months
期刊介绍: Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.
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