S Shanmuga Sundari, D Ganesh, P Kanchana, N Arnadevi, A K Chaudhary, B Prabha Devi
{"title":"Growth, structural, thermal and THz generation properties of modified DAST, CMST and BMST crystals: A comparative study","authors":"S Shanmuga Sundari, D Ganesh, P Kanchana, N Arnadevi, A K Chaudhary, B Prabha Devi","doi":"10.1007/s12043-024-02753-y","DOIUrl":null,"url":null,"abstract":"<div><p>Growth of 4-<i>N</i>-<i>N</i>-dimethylamino-4<span>\\(^\\prime \\)</span>-<i>N</i><span>\\(^\\prime \\)</span>-methyl-stilbazolium tosylate (DAST), 4-chloro-<i>N</i>-methyl 4-stilbazolium tosylate (CMST) and 4-bromo-<i>N</i>-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 <span>\\(0.67 \\times 10^{-4}\\)</span>, <span>\\(0.826\\times 10^{-4}\\)</span> and <span>\\(0.947 \\times 10^{-4}\\)</span>, respectively. Finally, the significance of effective polarisability in THz generation has been demonstrated in terms of rotational angle <span>\\(\\theta \\)</span>.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pramana","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s12043-024-02753-y","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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 \(\theta \).
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.