Mohd Anis

Study on optical properties of l-valine doped ADP crystal

Single crystal of l-valine doped ammonium dihydrogen phosphate has been grown by slow evaporation method at room temperature. The crystalline nature of the grown crystal was confirmed using powder X-ray diffraction technique. The different functional groups of the grown crystal were identified using Fourier transform infrared analysis. The UV-visible studies were employed to examine the high optical transparency and influential optical constants for tailoring materials suitability for optoelectronics applications. The cutoff wavelength of the title crystal was found to be 280nm with wide optical band gap of 4.7eV. The dielectric measurements were carried to determine the dielectric constant and dielectric loss at room temperature. The grown crystal has been characterized by thermogravimetric analysis. The second harmonic generation efficiency of the grown crystal was determined by the classical Kurtz powder technique and it is found to be 1.92 times that of potassium dihydrogen phosphate. The grown crystal was identified as third order nonlinear optical material employing Z-scan technique using He-Ne laser operating at 632.8nm.

Influence of Nd3+ on zinc tris-thiourea sulphate single crystal: a comparative crystal growth, structural, linear–nonlinear optical and dielectric study to explore NLO device applications

Abstract In present investigation, crystals of pure and Nd3+ doped zinc tris-thiourea sulphate (ZTS) material have been grown from aqueous solution at room temperature by employing slow evaporation technique. The incorporation of Nd3+ in ZTS crystal complex has been qualitatively determined by means of energy-dispersive spectroscopic technique. The crystalline phase and structural parameters of grown crystals have been confirmed by powder X-ray diffraction technique. The influence of Nd3+ on optical transparency of ZTS crystal has been examined in the range of 190–1100 nm. The transmittance data have been used to evaluate the vital optical constants (extinction coefficient, refractive index and reflectance) of grown crystals to discuss the utility for distinct optical applications. The enhancement in SHG efficiency of Nd3+ doped ZTS crystal has been confirmed by Kurtz–Perry powder test. The nature of dielectric constant and dielectric loss of pure and Nd3+ doped ZTS crystal has been comparatively investigated in the temperature range of 35–110 °C. 1. Growth of pure and Nd3+ doped ZTS crystal is reported for the first time 2. XRD analysis confirmed good crystalline nature of Nd3+ doped ZTS crystal 3. Nd3+ significantly improved the linear optical response of ZTS crystal 4. Enhanced SHG efficiency of Nd3+ doped ZTS crystal is 1.4 times that of ZTS crystal 5. Lower dielectrics of Nd3+ doped ZTS crystal are vital for optoelectronics applications

Single crystal growth and enhancing effect of glycine on characteristic properties of bis-thiourea zinc acetate crystal

A single crystal of glycine-doped bis-thiourea zinc acetate (G-BTZA) with a dimension of 15 × 6 × 4 mm3 has been grown using the slow solution evaporation technique. The structural parameters of the crystals were determined using the single crystal XRD technique. The increase in optical transparency of the doped BTZA crystal was ascertained in the range of 200 to 900 nm using UV–visible spectral analysis. The improved optical band gap of the G-BTZA crystal is found to be 4.19 eV, and vital optical constants have been calculated using the transmittance data. The influence of glycine on the mechanical parameters of the BTZA crystal has been investigated via microhardness studies. The thermal stability of pure and doped BTZA crystals has been determined by employing the thermogravimetric and differential thermal analysis technique. The improvement in the dielectric properties of the BTZA crystal after the addition of glycine has been evaluated in a temperature range of 30 to 120 °C at a frequency of 100 KHz. The SHG efficiency of the glycine-doped BTZA crystal is found to be much higher than KDP and BTZA crystal material in a Kurtz–Perry powder analysis.

Doping effect of carboxylic acids on optical, electrical, mechanical and thermal traits of KDP crystal

Abstract Single crystals of maleic acid (MA)- and oxalic acid (OA)-doped potassium dihydrogen phosphate (KDP) materials have been grown by slow evaporation solution technique. The structural parameters of the grown crystals have been determined using the single crystal X-ray diffraction technique. Fourier transform infrared analysis has been done to identify the functional groups of grown crystals. The modifications in optical transmittance, optical band gap and different optical constants of KDP crystal due to addition of MA and OA have been investigated by means of UV–Visible spectral analysis. The Vicker’s microhardness studies have been carried out to examine the mechanical behaviour of pure and doped KDP crystals. The influence of dopants on thermal stability of KDP crystal has been investigated using the thermogravimetric and differential thermal analysis. The dielectric constant, dielectric loss, ac resistivity and ac conductivity of pure and doped KDP crystals were evaluated under dielectric studies.

Optical, thermal and electrical properties of pure and doped bis-thiourea cadmium formate (BTCF) crystal

A glycine doped bis-thiourea cadmium formate (BTCF) crystal has been grown by a slow solution evaporation technique. The shifts in vibrational frequencies of different functional groups of BTCF were identified by Fourier transform infrared (FT-IR) spectral analysis. UV-visible studies were employed to assess the optical transparency of pure and doped BTCF crystals. The optical band gap of doped BTCF is found to be 5.16 eV. The optical constants, refractive index, reflectance, and optical conductivity have been evaluated, using the transmission data. The dielectric characteristics of pure and doped BTCF were investigated by employing dielectric studies. The decomposition temperature of pure and doped BTCF crystals was determined by using thermogravimetric analysis. The encouraging third-order nonlinear optical properties of pure and doped BTCF crystals were examined by employing the Z-scan technique at 632.8 nm.

Monocrystal growth and characterization study of α- and γ-polymorph of glycine to explore superior performance of γ-glycine crystal

Abstract Optical quality single crystals of α- and γ-polymorph of glycine with respective dimension of 16 × 04 × 04 and 16 × 14 × 08 mm3 have been grown from slow solvent evaporation technique. The single crystal X-ray diffraction (XRD) study has been carried out to confirm the cell parameters, crystal structure and space group of grown polymorphs of glycine crystal. The powder XRD analysis has been performed to investigate the crystalline nature of γ-glycine crystal. The UV-visible spectral analysis has been carried out in the range of 200–900 nm to determine the optical transmittance and band gap of grown crystals. In Kurtz-Perry test, the second harmonic generation efficiency of γ-glycine crystal is found to be 1.4 times higher than KDP crystal material. The emission profile and electronic purity of grown crystals has been examined by means of photoluminescence study. The differential thermal analysis of grown crystals has been undertaken to determine the melting point of grown polymorphs of glycine crystal. The temperature dependent behavior of dielectric parameters of grown crystals has been comparatively investigated within 35–90 °C by means of dielectric analysis.

Evaluate the effect of L-valine on linear–nonlinear optical and electrical properties of BTCA crystal to identify photonic device applications

In this study, pure and l-valine (LV)-doped bis-thiourea cadmium acetate (BTCA) crystals have been grown by slow solution evaporation technique. For the first time, LV has been used as a dopant to tune the optical (linear and third-order non-linear optical) and electrical properties of BTCA crystal which are vital for various integrated optic device applications. The UV-visible spectral analysis has been performed in the range of 200–900 nm to determine the optical transparency of grown crystals. The Z-scan (open and closed apertures) studies were undertaken at 632.8 nm to ascertain the nature of third-order non-linearity in grown crystals. The third-order non-linear optical parameters such as non-linear refraction (n2), absorption coefficient (β) and susceptibility (χ3) of grown crystals have been calculated. The susceptibility (χ3) of pure and LV-doped BTCA crystal is found to be 2.58 × 10−4 esu and 3.34 × 10−4 esu, respectively. The electrical studies have been carried out to analyse the dielectric constant, dielectric loss, ac resistivity and ac conductivity of pure and LV-doped BTCA crystals.

Growth, structural UV–visible, SHG, mechanical and dielectric studies of bis-thiourea zinc chloride doped KDP crystal for NLO device applications

Optically transparent 11 × 10 × 4 mm3 bis-thiourea zinc chloride (BTZC) doped potassium dihydrogen phosphate (KDP) crystal has been grown by slow evaporation solution technique. The cell parameters of the grown crystal have been determined by single crystal X-ray diffraction analysis. The incorporation of BTZC in KDP crystal has been qualitatively analysed by FT-IR spectral analysis. The optical transparency and vital optical constants of BTZC doped KDP single crystals have been evaluated in the range of 200–900 nm. The mechanical behaviour of pure and doped KDP crystals has been investigated under the Vickers microhardness studies. The dielectric parameters of grown crystal have been investigated within the frequency range of 10–100 KHz. In Kurtz–Perry powder test, the second harmonic generation (SHG) efficiency of BTZC doped KDP crystal is found to be 1.65 times that of KDP material.

Investigation on nonlinear optical and dielectric properties of L-arginine doped ZTC crystal to explore photonic device applications

Abstract The present study is focused to explore the photonic device applications of L-arginine doped ZTC (LA-ZTC) crystals using nonlinear optical (NLO) and dielectric studies. The LA-ZTC crystals have been grown by slow evaporation solution technique. The chemical composition and surface of LA-ZTC crystal have been analyzed by means of energy dispersive spectroscopy (EDS) and surface scanning electron microscopy (SEM) techniques. The Vicker’s microhardness study has been carried out to determine the hardness, work hardening index, yield strength and elastic stiffness of LA-ZTC crystal. The enhanced SHG efficiency of LA-ZTC crystal has been ascertained using the Kurtz-Perry powder SHG test. The closed-and-open aperture Z-scan technique has been employed to confirm the third order nonlinear optical nature of LA-ZTC crystal. The Z-scan transmittance data has been utilized to calculate the superior cubic susceptibility, nonlinear refractive index, nonlinear absorption coefficient and figure of merit of LA-ZTC crystal. The behavior of dielectric constant and dielectric loss of LA-ZTC crystal at different temperatures has been investigated using the dielectric analysis.

Growth, linear–non-linear optical, fluorescence, thermal and electrical studies of glycine-doped bis-thiourea cadmium formate crystal for electro-optic device applications

Abstract In the present investigation, glycine has been doped in bis-thiourea cadmium formate (BTCF) and single crystal was grown by slow solution evaporation technique. The incorporation of glycine in BTCF crystal was confirmed by Fourier transform infrared (FTIR) analysis. The UV-visible transmittance spectrum of pure and doped BTCF crystals was recorded to comparatively analyse the optical transparency, optical bandgap and other optical constants. The third-order non-linear behaviour of grown crystals has been investigated at 632.8 nm using Z-scan technique, and vital third-order non-linear optical (NLO) constants were calculated. The second harmonic generation (SHG) efficiency of doped BTCF crystal is found to be 2.15 times that of KDP material. The fluorescence studies of doped BTCF crystal confirmed the red colour emission in the visible region. The thermal stability of grown crystals was determined by means of thermogravimetric analysis (TGA). The dielectric measurement studies were performed at room temperature. The surface morphology of doped BTCF crystal was analysed by scanning electron microscopy (SEM) technique.