فهرست

محاسبه ضرایب شکست، ضرایب جذب و پذیرفتاری مرتبه سوم در مخلوط بلورمایع نماتیک 5CB و نانوذرات ZnS

نشریه: زمستان 98 - مقاله 7   صفحات :   تا 



کد مقاله:
nm-627

مولفین:
زهرا دهقانی: دانشگاه نیشابور - گروه فیزیک
مرضیه ندافان
عباس فرجی الموتی: دانشگاه نیشابور - فیزیک


چکیده مقاله:

در این پژوهش، پذیرفتاری مرتبه سوم نانوذرات ZnS که در بلورمایع نماتیک 5CB آلاییده شده مورد بررسی و آنالیز قرار گرفته است. ابتدا نانوذرات ZnS به¬روش هیدروترمال تهیه شدند. سپس این نانوذرات با درصد وزنی wt. 1 به بلورمایع نماتیک اضافه شد. بعد از آن، برای محاسبه پذیرفتاری مرتبه سوم، ضرایب جذب خطی و غیرخطی و ضرایب شکست خطی و غیرخطی به دست آمد. منبع نور مورد استفاده در این تحقیق، لیزر پیوسته هلیوم نئون با طول موج nm 632.8 می¬باشد. جهت¬گیری اولیه ملکول¬ها عمودی است. نتایج نشان می¬دهد که پدیده¬های غیرخطی خودواگرایی و جذب دو فوتونی در نمونه رخ داده است. با توجه به نتایج بدست آمده ضریب شکست غیرخطی و ضریب جذب غیرخطی بلور مایع نماتیک 5CB به همراه نانوذرات ZnS به ترتیب 5 و 3 برابر ضریب شکست و ضریب جذب غیرخطی بلور مایع نماتیک 5CB خالص می باشد.


Article's English abstract:

In this research, third order nonlinear susceptibility of ZnS nanoparticles NPs in nematic liquid crystals NLCs have been recorded and analyzed. ZnS NPs have been synthesized by the hydrothermal method. Afterwards, the nonlinear refractive NLR index, linear refraction index , nonlinear absorption NLA coefficient, linear absorption coefficient and third order nonlinear susceptibility, of pure NLCs and ZnS NPs in NLCs were measured using the z-scan technique by using a continues wave CW He: Ne laser at 632.8 nm wavelength. The measurements were performed for homeotropic initial alignments of NLCs molecules. Strong optical nonlinearity, self-defocusing and two photon absorption TPA effects are observed for pure NLCs and ZnS NPs in NLCs by homeotropic alignments. according to given results, the NLR index and the NLA coefficient of the 5CB NLCs doped by ZnS NPs five and three times of the NLR and the NLA coefficient of pure NLCs, respectively.


کلید واژگان:
بلورمایع نماتیک، نانوذرات ZnS، ضریب جذب ، ضریب شکست، خواص نوری غیرخطی، پذیرفتاری مرتبه سوم، روش روبش-z

English Keywords:
Nematic liquid crystals,ZnS nanoparticles, refraction index, adsorption coefficient, Nonlinear Optical properties, Third order nonlinear susceptibility, Z-scan technique

منابع:
[1] U. B. Singh, R. Dhar, R. Dabrowski, M. B. Pandey, “Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO3 nanoparticles,” Liquid Crystals, 41, 953–959, 2014. [2] K. K. Vardanyan, A. Thiel, B. Fickas, A. Daykin, “Multicomponent nematic systems with doped gold nanoparticles,” Liquid Crystals, 42, 445-455, 2015. [3] D. Jayoti, P. Malik, A. Singh, “Analysis of morphological behaviour and electro-optical properties of silica nanoparticles doped polymer dispersed liquid crystal composites, ” Molecular Liquids, 225, 456–461, 2017. [4] N. Topnani, V. Hamplová, M. Kašpar, V. Novotná, E. Gorecka, “Synthesis, characterisation and functionalisation of ZnO and TiO2 nanostructures: used as dopants in liquid crystal polymers, Liquid Crystals, 41, 91-100, 2014. [5] D. P. Singh, S. Pandey, S. K. Gupta, R. Manohar, A. Daoudi, A. H. Sahraoui, Chinmay Phadnis and S. Mahamuni, Quenching of photoluminescence and enhanced contrast of ferroelectric liquid crystal dispersed with Cd1-XZnXS/ZnS core/shell nanocrystals, Luminescence, 173, 250-256, 2016. [6] J. S. Roy, T. P. Majumder, R. D. browski, A. Dey, P. P. Ray, Tuning photoluminescence of liquid crystals doped ZnS nanoflakes, Optical Materials, 46, 467-471, 2015. [7] J.S. Roy, T.P. Majumder, R. Dabrowski, “Enhanced photoluminescence in CdS nanorods doped with antiferroelectric liquid crystals,” J. Luminescence, 148, 330-333, 2014. [8] M. Rana, N. Singla, A.Chatterjee, A. Shukla, P. Chowdhury, Investigation of nonlinear optical (NLO) properties by charge transfer contributions of amine functionalized tetraphenylethylene, Optical Materials, 62, 80- 89, 2016. [9] R. Miedzinski, I. Fuks-Janczarek, L. R. P. Kassab, F. A. Bomfim, Second and third order nonlinear optical properties of Er3 /Yb3 doped PbO-GeO2-Ga2O3 glasses with Au nanoparticles, Materials Research Bulletin, 95, 339-348, 2017. [10] E. Saievar Iranizad, Z. Dehghani, M. Nadafan, “Nonlinear Optical Properties of Nematic Liquid Crystal Doped with Different Compositional Percentage of Synthesis of Fe3O4 Nanoparticles,” Molecular Liquids, 190, 6–9, 2014. [11] M. D. Zidan, M. B. Alsous, A. W. Allaf, A. Allahham, A. AL-Zier, H. Rihawi, “Z-scan measurements of the third order optical nonlinearity of C60 doped poly(ethylacetylenecarboxylate) under CW regime, ” Optik, 127, 2566–2569, 2016. [12] M. Sheik-Bahae, A.A. Said, T.H. Wei, D.J. Hagan, E.W. Van Stryland, “Sensitive measurement of optical nonlinearities using a single beam, ” IEEE Journal of Quantum Electronics, QE-26, 760-769, 1989. [13] P. Mande, E. Mathew, S. Chitrambalam, I. H. Joe, N. Sekar, “NLO properties of 1, 4-naphthoquinone, Juglone and Lawsone by DFT and Z-scan technique e A detailed study, ” Optical Materials, 72, 549-558, 2017. [14] Z. Dehghani, E. Saievar Iranizad, “The effect of initial alignment on the optical properties of Fe3O4 nanoparticles doped in nematic liquid crystals,”Physica B, 434, 165–170, 2014. [15] Z. Dehghani, N. Dalir, M. Nadafan, M.H. Majles Ara, E. Saievar Iranizad, “Investigation of electrical and nonlinear optical properties of colloidal composite nematic liquid crystal, ” Molecular Liquids, 225, 502–509, 2017. [16] N. Dalir, S. Javadian, Z. Dehghani, “High optical nonlinearity of nematic liquid crystal doped with graphen oxide,” Molecular Liquids, 244, 103–109, 2017. [17] N. Yadav, R. Dabrowski, R. Dhar, “Effect of alumina nanoparticles on dielectric permittivity, electrical conductivity, director relaxation frequency, threshold and switching voltages of a nematic liquid crystalline material,” Liquid Crystals, 41, 1803-1810, 2014. [18] Z. Dehghani, Z. Shadrokh, M. Nadafan, “The effect of magnetic metal doping on the structural and the third-order nonlinear optical properties of ZnS nanoparticles,” Optik, 131, 925–931, 2017. [19] L. Wang, F. Meng, Y. Sun, H. Yang, “Effect of surfactant-modified ZnS:Mn nanoparticles on the electro-optical properties of composite polymer-dispersed liquid crystal films, ” Composites Part B, 45, 780–784, 2013. [20] M. Yıldırım, O. Köysal, G. Önsal, E. Gümüş, “Effect of iron phthalocyanine (FePc) concentration on electrical and dielectric properties of the nematic liquid crystal composites,” Molecular Liquids, 223, 868-872, 2016. [21] Z. Dehghani, E. Saievar Iranizad, “The effect of initial alignment on the optical properties of Fe3O4 nanoparticles doped in nematic liquid crystals,”Physica B, 434, 165–170, 2014. [22] M. H. Majlesara, Z. Dehghani, E. Saievar Iranizad, “Synthesis, characterization and single-beam Z-scan measurement of the third-order optical nonlinearities of ZnO nano-particles,” International Journal of Modern Physics B, 22, 3165-3171, 2008. [23] I. Janossy, “Optical reorientation in dye-doped liquid crystals,” Nonlinear Optical Physics

English References:
[1] U. B. Singh, R. Dhar, R. Dabrowski, M. B. Pandey, “Enhanced electro-optical properties of a nematic liquid crystals in presence of BaTiO3 nanoparticles,” Liquid Crystals, 41, 953–959, 2014. [2] K. K. Vardanyan, A. Thiel, B. Fickas, A. Daykin, “Multicomponent nematic systems with doped gold nanoparticles,” Liquid Crystals, 42, 445-455, 2015. [3] D. Jayoti, P. Malik, A. Singh, “Analysis of morphological behaviour and electro-optical properties of silica nanoparticles doped polymer dispersed liquid crystal composites, ” Molecular Liquids, 225, 456–461, 2017. [4] N. Topnani, V. Hamplov?, M. Ka?par, V. Novotn?, E. Gorecka, “Synthesis, characterisation and functionalisation of ZnO and TiO2 nanostructures: used as dopants in liquid crystal polymers, Liquid Crystals, 41, 91-100, 2014. [5] D. P. Singh, S. Pandey, S. K. Gupta, R. Manohar, A. Daoudi, A. H. Sahraoui, Chinmay Phadnis and S. Mahamuni, Quenching of photoluminescence and enhanced contrast of ferroelectric liquid crystal dispersed with Cd1-XZnXS/ZnS core/shell nanocrystals, Luminescence, 173, 250-256, 2016. [6] J. S. Roy, T. P. Majumder, R. D. browski, A. Dey, P. P. Ray, Tuning photoluminescence of liquid crystals doped ZnS nanoflakes, Optical Materials, 46, 467-471, 2015. [7] J.S. Roy, T.P. Majumder, R. Dabrowski, “Enhanced photoluminescence in CdS nanorods doped with antiferroelectric liquid crystals,” J. Luminescence, 148, 330-333, 2014. [8] M. Rana, N. Singla, A.Chatterjee, A. Shukla, P. Chowdhury, Investigation of nonlinear optical (NLO) properties by charge transfer contributions of amine functionalized tetraphenylethylene, Optical Materials, 62, 80- 89, 2016. [9] R. Miedzinski, I. Fuks-Janczarek, L. R. P. Kassab, F. A. Bomfim, Second and third order nonlinear optical properties of Er3 /Yb3 doped PbO-GeO2-Ga2O3 glasses with Au nanoparticles, Materials Research Bulletin, 95, 339-348, 2017. [10] E. Saievar Iranizad, Z. Dehghani, M. Nadafan, “Nonlinear Optical Properties of Nematic Liquid Crystal Doped with Different Compositional Percentage of Synthesis of Fe3O4 Nanoparticles,” Molecular Liquids, 190, 6–9, 2014. [11] M. D. Zidan, M. B. Alsous, A. W. Allaf, A. Allahham, A. AL-Zier, H. Rihawi, “Z-scan measurements of the third order optical nonlinearity of C60 doped poly(ethylacetylenecarboxylate) under CW regime, ” Optik, 127, 2566–2569, 2016. [12] M. Sheik-Bahae, A.A. Said, T.H. Wei, D.J. Hagan, E.W. Van Stryland, “Sensitive measurement of optical nonlinearities using a single beam, ” IEEE Journal of Quantum Electronics, QE-26, 760-769, 1989. [13] P. Mande, E. Mathew, S. Chitrambalam, I. H. Joe, N. Sekar, “NLO properties of 1, 4-naphthoquinone, Juglone and Lawsone by DFT and Z-scan technique e A detailed study, ” Optical Materials, 72, 549-558, 2017. [14] Z. Dehghani, E. Saievar Iranizad, “The effect of initial alignment on the optical properties of Fe3O4 nanoparticles doped in nematic liquid crystals,”Physica B, 434, 165–170, 2014. [15] Z. Dehghani, N. Dalir, M. Nadafan, M.H. Majles Ara, E. Saievar Iranizad, “Investigation of electrical and nonlinear optical properties of colloidal composite nematic liquid crystal, ” Molecular Liquids, 225, 502–509, 2017. [16] N. Dalir, S. Javadian, Z. Dehghani, “High optical nonlinearity of nematic liquid crystal doped with graphen oxide,” Molecular Liquids, 244, 103–109, 2017. [17] N. Yadav, R. Dabrowski, R. Dhar, “Effect of alumina nanoparticles on dielectric permittivity, electrical conductivity, director relaxation frequency, threshold and switching voltages of a nematic liquid crystalline material,” Liquid Crystals, 41, 1803-1810, 2014. [18] Z. Dehghani, Z. Shadrokh, M. Nadafan, “The effect of magnetic metal doping on the structural and the third-order nonlinear optical properties of ZnS nanoparticles,” Optik, 131, 925–931, 2017. [19] L. Wang, F. Meng, Y. Sun, H. Yang, “Effect of surfactant-modified ZnS:Mn nanoparticles on the electro-optical properties of composite polymer-dispersed liquid crystal films, ” Composites Part B, 45, 780–784, 2013. [20] M. Y?ld?r?m, O. K?ysal, G. ?nsal, E. Gümü?, “Effect of iron phthalocyanine (FePc) concentration on electrical and dielectric properties of the nematic liquid crystal composites,” Molecular Liquids, 223, 868-872, 2016. [21] Z. Dehghani, E. Saievar Iranizad, “The effect of initial alignment on the optical properties of Fe3O4 nanoparticles doped in nematic liquid crystals,”Physica B, 434, 165–170, 2014. [22] M. H. Majlesara, Z. Dehghani, E. Saievar Iranizad, “Synthesis, characterization and single-beam Z-scan measurement of the third-order optical nonlinearities of ZnO nano-particles,” International Journal of Modern Physics B, 22, 3165-3171, 2008. [23] I. Janossy, “Optical reorientation in dye-doped liquid crystals,” Nonlinear Optical Physics



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