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G. Vinitha

Bio: G. Vinitha is an academic researcher from VIT University. The author has contributed to research in topics: Single crystal & Crystal. The author has an hindex of 23, co-authored 251 publications receiving 2106 citations. Previous affiliations of G. Vinitha include B. S. Abdur Rahman University & Anna University.


Papers
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Journal ArticleDOI
TL;DR: In this paper , single crystals of the newly concocted 2-amino-6-methyl pyridine-1-ium 2-carboxy-6nitro benzoate (MPNP) were grown by slow evaporation approach using an equimolar ethanol-water mixed solvent.

2 citations

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TL;DR: In this paper, a single crystal X-ray diffraction of BDB was performed to study the photo response property of the BDB single crystal and the charge transport mechanism of single crystals were analyzed using dielectric measurement.
Abstract: Benzimidazolium 3,5-dinitrobenzoate (BDB) was synthesized using benzimidazole and 3,5-dintirobenzoic acid as starting materials. Solubility measurements were performed for the obtained product. Single crystals were grown using acetone as a solvent. The crystal structure of BDB was confirmed using single crystal X-ray diffractions. The compound crystallizes in the monoclinic system with space group P21/c. The transparency of grown crystal in the entire visible region was studied using UV–Vis-NIR spectrum. The photo response property of BDB single crystal was studied using photoconductivity studies. The charge transport mechanism of BDB single crystals were analyzed using dielectric measurement. Hardness studies reveal that BDB crystal shows the reverse indentation size effect. Nd:YAG laser of 532 nm wavelength was used to study the laser damage threshold of the title compound. Z-scan measurement was carried out on the grown BDB single crystal to measure the nonlinear parameters in third order.

2 citations

Journal ArticleDOI
TL;DR: In this article, a single crystal of hybrid framework of Piperazinium perchlorate (PPCL) has been achieved by Slow Evaporation Solution Technique (SEST) and the result of various growth parameters and different physico-chemical characterization of PPCL crystals were studied.

2 citations

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TL;DR: An enhanced method of synthesizing silver nanoparticles (AgNPs) is adopted in this paper using the aqueous extract of Decalepis hamiltonii root as both reducing and capping agents.
Abstract: An enhanced method of synthesizing silver nanoparticles (AgNPs) is adopted herein using the aqueous extract of Decalepis hamiltonii root as both reducing and capping agents. In the recent years, metal nanoparticles have been actively synthesized using green route which is considered as an efficient, inexpensive and eco-friendly method. The generation of AgNPs was first observed from the UV–visible spectroscopy. The XRD analysis confirms the FCC structure with an average crystal size of 22 nm which is calculated using Scherrer’s formula. The functional group responsible for the reduction of AgNPs is identified from the FTIR analysis. Transmission electron microscopy (TEM) showed the formation of silver nanoparticles of size ranging from 5 to 20 nm with few agglomerations. The antibacterial studies were carried out against the Escherichia coli and Staphylococcus aureus using minimum inhibitory concentration (MIC) technique. The third-order nonlinear optical properties of AgNPs were measured by the Z-scan technique. The negative nonlinearity observed was utilized for the study of optical limiting behavior.

2 citations


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Journal Article
TL;DR: In this article, a class of π;-conjugated compounds that exhibit large δ (as high as 1, 250 × 10−50 cm4 s per photon) and enhanced two-photon sensitivity relative to ultraviolet initiators were developed and used to demonstrate a scheme for three-dimensional data storage which permits fluorescent and refractive read-out, and the fabrication of 3D micro-optical and micromechanical structures, including photonic-bandgap-type structures.
Abstract: Two-photon excitation provides a means of activating chemical or physical processes with high spatial resolution in three dimensions and has made possible the development of three-dimensional fluorescence imaging, optical data storage, and lithographic microfabrication. These applications take advantage of the fact that the two-photon absorption probability depends quadratically on intensity, so under tight-focusing conditions, the absorption is confined at the focus to a volume of order λ3 (where λ is the laser wavelength). Any subsequent process, such as fluorescence or a photoinduced chemical reaction, is also localized in this small volume. Although three-dimensional data storage and microfabrication have been illustrated using two-photon-initiated polymerization of resins incorporating conventional ultraviolet-absorbing initiators, such photopolymer systems exhibit low photosensitivity as the initiators have small two-photon absorption cross-sections (δ). Consequently, this approach requires high laser power, and its widespread use remains impractical. Here we report on a class of π;-conjugated compounds that exhibit large δ (as high as 1, 250 × 10−50 cm4 s per photon) and enhanced two-photon sensitivity relative to ultraviolet initiators. Two-photon excitable resins based on these new initiators have been developed and used to demonstrate a scheme for three-dimensional data storage which permits fluorescent and refractive read-out, and the fabrication of three-dimensional micro-optical and micromechanical structures, including photonic-bandgap-type structures.

1,833 citations

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TL;DR: This Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting and describes the known mechanisms of optical limiting for the different types of materials.
Abstract: The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the functi...

424 citations

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TL;DR: In this article, a review highlights the applied protocols to ameliorate the photoactivity of graphitic carbon nitride (g-C3N4) based nanocomposites through combining with various materials.

381 citations

Journal ArticleDOI
TL;DR: In this article, the authors survey the recent advances in nonlinear optics and the applications of two-dimensional (2D) materials and highlight a few representative current applications of 2D materials to photonic and optoelectronic devices.
Abstract: In this review, we survey the recent advances in nonlinear optics and the applications of two-dimensional (2D) materials. We briefly cover the key developments pertaining to research in the nonlinear optics of graphene, the quintessential 2D material. Subsequently, we discuss the linear and nonlinear optical properties of several other 2D layered materials, including transition metal chalcogenides, black phosphorus, hexagonal boron nitride, perovskites, and topological insulators, as well as the recent progress in hybrid nanostructures containing 2D materials, such as composites with dyes, plasmonic particles, 2D crystals, and silicon integrated structures. Finally, we highlight a few representative current applications of 2D materials to photonic and optoelectronic devices.

235 citations

Journal ArticleDOI
TL;DR: In this article, the nonlinear optical properties of metal nanoparticles (including copper, silver, gold, and bismuth nanoparticles) doped in various bases have been discussed.
Abstract: Metal nanoparticles (MNPs) hold great technological promise because of the possibility of engineering their electronic and optical properties through material design. One of the effective methods to fabricate MNPs is ion implantation. In this review, recent results on the nonlinear optical properties of nanoparticles (including copper, silver, gold, and bismuth nanoparticles) doped in various bases have been discussed. Some specific optical nonlinear properties, such as nonlinear refraction, two-photon absorption, and optical limiting, for femtosecond, picosecond, and nanosecond laser pulses have also been covered. In addition to ion implantation, we have summarized several other methods for the preparation of composite materials, and Z-scan has been used to study the nonlinear optical properties of these materials.

232 citations