In the present work, a new organic second order NLO material: L-isoleucinium p-toluenesulfonate monohydrate (LIPT) is synthesized and reported for the first time. The LIPT is crystallized in a non-centrosymmetric monoclinic space group P21. Structural and hydrogen bond nature of the compound is analyzed using single crystal X-ray diffraction studies. The crystal exhibits very good optical properties such as wide optical transparency in the region of 210 nm to 1100 nm and the ultraviolet wavelength emission (λ = 283 nm). The second harmonic generation efficiency is found to be 1.7 times the standard KDP. Good thermal, mechanical properties and low dielectric constant at high frequency range show that the material may be a potential candidate for optoelectronic applications.
It is important to grow and characterize new bimetallic thiocyanate single crystals as they are expected to exhibit useful optical and electrical properties. In the present study, calcium cadmium thiocyanate CaCd(SCN)4 single crystals were grown by slow evaporation of solvent and were characterized chemically, structurally, thermally, optically and electrically. X-ray diffraction analysis indicates that the grown crystal belongs to the tetragonal crystal system with lattice parameters: a = b = 12.2491(7) Å and c = 15.1012(5) Å. EDAX spectral analysis confirms the expected chemical composition. Thermogravimetric (TG/DTA) measurement implies good thermal stability. Optical (UV-Vis-NIR absorption spectral and SHG efficiency) measurements suggest good optical absorption in the UV and blue regions and the SHG efficiency of 6.13 (in urea unit). The dielectric measurements carried out in the temperature range of 40 °C to 150 °C at five different frequencies, viz. 100 Hz, 1 kHz, 10 kHz, 100 kHz and 1 MHz indicate a normal dielectric behavior.
Ömer Tamer, Ahmet Sefa Atalay, Davut Avci, Yusuf Atalay, Erdoğan Tarcan and Mariusz K. Marchewka
Nonlinear optical (NLO) materials have gathered great attention in recent years with respect to their potential applications in various fields, such as electro-optic modulation, frequency conversion, optical parametric oscillations, optical communication and optical computing [ 1 - 4 ]. In these fields, organic materials have some advantages over their inorganic counterparts, and it is stated that organic materials may eventually replace the inorganic ones in industrial applications [ 5 ]. The advantages of organic materials are that these
Single crystals of pure and L-threonine added tartaric acid (LT/TA), organic nonlinear optical (NLO) materials were grown from their respective aqueous solution by slow evaporation method. The crystalline nature of the grown crystals was confirmed by powder X-ray diffraction analysis (XRD). UV-Vis-NIR absorption and transmission spectra revealed that the lower cut-off wavelength was around 281 nm and the crystals exhibited high transmission over visible and near IR region. The presence of the functional groups such as O–H, C–H, C–O, C=O in the grown crystals was confirmed by FT-IR analysis. CHN analysis was carried out to confirm the presence of L-threonine in the grown crystals. Microhardness study on the crystals revealed that the hardness number Hv increased with the applied load. The growth pattern of the crystals were analyzed through etching analysis from which the etch patterns in the shape of ‘step-triangle’ were observed. The second harmonic generation (SHG) properties of pure and L-threonine doped tartaric acid crystals were confirmed by Kurtz-Perry powder technique.
optical properties. J. Phys. Chem. A. 114(15), 5099-5103. DOI: 10.1021/jp1002758.
Ivanova, B. & Spiteller, M. (2010). Possible application of the organic barbiturates as NLOmaterials. Cryst. Growth Des. 10(6), 2470-2474. DOI: 10.1021/cg100284r.
Kolev, T., Koleva, B., Seidel, R., Spiteller, M. & Sheldrick, W. (2009). New aspects on the origin of color in the solid state. Coherently shifting of the protons in violurate crystals. Cryst. Growth Des. 9(8), 3348-3352. DOI: 10.1021/cg900188k
L. Chandra, J. Chandrasekaran, K. Perumal, B. Babu and V. Jayaramakrishnan
Organic nonlinear optical crystals have been prominently investigated in the recent years owing to their high nonlinearity and rapid response to electro-optic effect. Significant interests were shown in the design and development of new NLOmaterials because of their vital applications in the generation of higher harmonic frequencies, frequency mixing, self-focusing, electro-optic modulation, optical parametric oscillator, etc. [ 1 – 4 ]. Generally, π-conjugated systems, linking the donor and acceptor, show a large NLO response. Acentric
N. Manopradha, S. Rama, S. Gowri, K. Kirubavathi and K. Selvaraju
, Evaluation of kinetic parameters for water soluble crystals by thermo gravimetric analysis, Journal of Crystal Growth, 409, 32–38, 2015. 10.1016/j.jcrysgro.2014.09.038 Rama S. Surendra Dilip C. Rajesh Narayana Perumal, Evaluation of kinetic parameters for water soluble crystals by thermo gravimetric analysis Journal of Crystal Growth 409 32 38 2015
 V. Sasikala, D. Sajan, N. Vijayan, K. Chaitanya, M. S. Babu Raj, B.H. Selin Joy, Electronic structure, vibrational spectral and intervening orbital interaction studies of NLOmaterial: Guanidium 4-nitrobenzoate
A. Arputha Latha, M. Anbuchezhiyan, C. Charles Kanakam and K. Selvarani
, thermal effect becomes important for the pulse width that is of nanosecond and longer. The local heating caused by macroscopic inclusion is also a more severe problem in the high intensity short-pulse system than in low-intensity long-pulse. In the present work, we have used 8 ns pulse.
(a) multiple shot Laser damage pattern of γ-glycine for (−1 0 1) plane and (b) single shot laser damage pattern of γ-glycine for (−1 0 1) plane.
Nonlinear optical study
NLOmaterials have attracted increasing attention due to their wide applications in the
S.M. Azhar, Mohd Anis, S.S. Hussaini, S. Kalainathan, M.D. Shirsat and G. Rabbani
. It is evident that doping of glycine has a positive impact on characteristic features of BTCF, BTCC, ZTS, ZTC and BTCA crystals [ 5 – 9 ]. Potassium thiourea chloride (PTC) crystal is a promising NLOmaterial having a tetragonal structure, good optical transparency, moderate hardness and high thermal stability  . It is noteworthy that till date no doping attempt has been made in case of PTC crystal as well as no investigations were accomplished
to study the dielectric, third order nonlinear optical (TONLO) and surface characteristics of PTC crystal doped by an
been used extensively as an effective method to investigate organic NLOmaterials [ 78 , 79 ].
The calculated values of μ, α and β are 9.007 Debye, 38.299 Å 3 and 4.868 esu for the title compound. Urea is used as one of the prototypical molecules in the study of NLO properties of molecular systems. Therefore, it has been used frequently as a threshold value for comparative purposes [ 78 ]. The values of α and β of the title compound are greater than those of urea (the α and β of urea are 5.042 Å 3 and 0.78 × 10 −30 esu obtained using the B3LYP/6-311++G