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Second and third order nonlinear optical studies of a novel thiophene substituted chalcone derivative
摘要： A noncentrosymmetric chalcone derivative (E)-1-(thiophen-2-yl)-3-(3, 4, 5-trimethoxyphenyl) prop-2-en-1-one (TTMP) was synthesized using Claisen Schmidt condensation approach and single crystals were grown using slow evaporation method. The grown TTMP crystals crystallises in orthorhombic structure with Pna21 space group. The intermolecular interactions of the TTMP crystals were envisioned by Hirshfeld surface analysis (HSA). Further, the structural conformations of the crystal were carried out by using 1H NMR, FTIR and FT-Raman spectral analysis. The UV-Vis-NIR spectrum of the sample clearly shows the prime transparency in the entire visible and near infrared region. Thermal studies (TG/DTA/DSC) of the TTMP sample shows excellent thermal stability and phase transition and also noticed that crystal was most stable up to 152.65 0C. The second harmonic generation efficiency was obtained for the crystals using Nd:YAG laser and is to be 1.93 times that of urea . The third order nonlinear absorption coefficient (β), nonlinear refractive index (n2), third-order nonlinear susceptibilities (χ (3)), second order hyper polarizability (γh) and optical limiting thresholds were determined by Z-scan technique using the Diode-Pumped Solid State (DPSS) Continuous Wave (CW) laser. The results suggest that the TTMP molecules are promising materials for optoelectronic device applications.
关键词： Hirshfeld surfaces,Optical limiting,SHG,Z-scan,Single crystal,Chalcones
更新于2025-09-09 09:28:46
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Reverse saturable absorption behaviour of Disodium 8-Hydroxy-5,7-Dinitro-2-Naphthalenesulfonate Hydrate for nonlinear optical applications
摘要： Nonlinear optical properties, vibrational features, optical and electronic properties of organic dye Disodium 8-Hydroxy-5,7-Dinitro-2-Naphthalenesulfonate Hydrate have been studied. Spectral and electronic properties were studied by FT-IR, FT-Raman and UV-visible spectroscopic technique combined with density functional theory (DFT) and time dependent density functional theory (TD-DFT) methods respectively. The intramolecular charge transfer interactions leading to nonlinear optical response have been analyzed by natural bond orbital analysis. The kinetic stability, chemical reactivity and electrophilicity index were studied by frontier molecular orbital analysis. The first- and second hyperpolarizabilities were calculated at DFT level using B3LYP and CAM-B3LYP hybrid functional. The third-order nonlinear optical performance of the compound have been investigated experimentally by open and closed aperture Z-scan techniques. Z-scan measurements were performed using Q-switched Nd: YAG laser with 5 ns pulses at 532 nm with different dye concentrations and intensities. The Z-scan results confirm the sign of nonlinear absorption and refraction is positive. The optical limiting threshold and laser damage threshold were measured. The obtained results promote the title compound can be considered as a promising candidate for developing future optoelectronic and photonic devices.
关键词： RSA,Third-order NLO,Optical limiting,Z-Scan,DFT
更新于2025-09-09 09:28:46
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Nonlinear absorption and Optical limiting of Ag–CdSe nano-hybrids of different growth times
摘要： Metal-semiconductor Nano-composites have enormous applications due to Plasmon –exciton coupling. Open aperture Z-scan is investigated for Ag–CdSe hybrid nanostructure, a toggle from saturable absorption process SA to reverse saturable absorption RSA is observed upon laser power increment. Proofs of crystal and morphological structure are given by selected area electron diffraction (SAED) and high resolution transmission electron microscope (HRTEM). Red shifting in photoluminescence spectra PL is observed which is ascribed to the particle size increment. Intriguing nonlinear findings can be used to engineer optical switching devices and optical limiters.
关键词： Photoluminescence,Open aperture Z scan,Ag:CdSe,Metal semiconductor nanohyrid structure,Optical limiting,Nonlinear absorption coefficient
更新于2025-09-04 15:30:14