• M S SWAPNA

      Articles written in Pramana – Journal of Physics

    • Tunable fluorescence from natural carbon source: Pandanus

      M S SWAPNA H V SARITHA DEVI G AMBADAS S SANKARARAMAN

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      Carbon materials possessing photoluminescence properties are considered as potential candidates in a wide range of photonic and optoelectronic applications. In this work, the cellulose derived from the natural source, Pandanus, is autoclave-treated for the synthesis of fluorescent carbon. The natural fibres are greatly preferred over synthetic ones due to their cost-effectiveness, easy processability, non-abrasivity, non-toxic and environment-friendly characteristics along with high mechanical strength and damage tolerance. These properties enable them to be used as templates for synthesis, as important reinforcement materials for commercial thermoplastics and for making value-added products. In this study, the synthesised sample is subjected to structural, morphological, elemental and optical characterisations. These studies reveal that the sample can be used as a low-cost tunable light-emitting source for photonic, biomedical and biosensing applications.

    • Speckle interferometric probing of intrafilm thermal-induced particle dynamics in RF-sputtered MoO$_3$ films

      S SOUMYA S SREEJYOTHI VIMAL RAJ M S SWAPNA S SANKARARAMAN

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      The study of surface morphology is an unavoidable part of thin-film characterisation. The present paper reports the application of electronic speckle interferometry in understanding the quality of thin films takingradio frequency sputtered MoO$_3$ films, prepared at two argon pressure 0.03 mbar and 0.05 mbar, as an example. The intrafilm thermal-induced particle dynamics on thin films’ surface morphology are studied using the cross-correlation,inertia moment, displacement vector, lacunarity and multifractal analyses. The study reveals that not only the argon pressure in the chamber but also the heating of the films significantly influence the surface morphology and quality of the film. The displacement vector, lacunarity and multifractal analyses also reveal that as-grown films prepared at 0.03 mbar argon pressure (M0.03) are better than as-grown films prepared at 0.05 mbar argon pressure(M0.05). Thus, the cross-correlation, inertia moment, displacement vector, lacunarity and multifractal analyses can effectively be used as surrogate methods for understanding the surface morphology.

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