ABSTRACT Nonlinear optical single crystals of L-phenylalanine-4-nitrophenol have been grown by the slow evaporation method. The grown crystal was subjected to the single crystal X-ray diffraction analysis, to confirm that it belongs to the monoclinic crystal structure, with space group P21.The optical transmission study reveals the transparency of the crystal in the entire visible region and the cut off wave length has been found to be 320 nm. The optical band gap is found to be 3.87 eV. The transmittance of the L-phenylalanine-4-nitrophenol crystal has been used to calculate the refractive index (n), the extinction coefficient (K) and the real (εr) and imaginary (εi) components of the dielectric constant. The mechanical behaviour of the grown crystals was studied using Vicker’s microhardness tester. The dielectric constant and dielectric loss of L-phenylalanine-4-nitrophenol are measured in the frequency range of 50 Hz to 5 MHz at different temperatures. The photoconductivity study confirms the negative photoconductive nature of the sample.
Cite this paper
S. Suresh, "The Growth and the Optical, Mechanical, Dielectric and Photoconductivity Properties of a New Nonlinear Optical Crystal—L-Phenylalanine-4-nitrophenol NLO Single Crystal," Journal of Crystallization Process and Technology, Vol. 3 No. 3, 2013, pp. 87-91. doi: 10.4236/jcpt.2013.33014.
 J. Zyss, “Molecular Nonlinear Optics: Materials Physics and Devices,” Academic Press, Boston, 1994.
 J. F. Nicoud, R. J. Twieg, D. S. Chemla and J. Zyss, “In Nonlinear Optical Properties of Organic Molecules and Crystals,” Academic Press, New York, 1987, pp. 227-296.
 D. S. Chemla and J. Zyss, “Nonlinear Optical Properties of Organic Molecules and Crystals,” Academic Press, New York, 1987.
 P. N. Prasad and D. J. Williams, “Introduction to Nonlinear Optical Effects in Organic Molecules and Polymers,” Wiley, New York, 1991.
 V. H. Rodrigues, M. M. R. R. Costa, E. M. Gomes, E. Nogueirab and M. S. Belslsey, “L-Phenylalanine-4-nitrophenol,” Acta Crystallographica, Vol. 62, 2006, pp. O699-O701.
 A. Ashour, N. El-Kadry and S. A. Mahmoud, “On the Electrical and Optical Properties of CdS Films Thermally Deposited by a Modified Source,” Thin Solid Films, Vol. 269, No. 1-2, 1995, pp.117-120.
 V. Gupta and A. Mansingh, “Influence of Postdeposition Annealing on the Structural and Optical Properties of Sputtered Zinc Oxide Film,” Journal of Applied Physics, Vol. 80, No. 2, 1996. p. 1063. doi:10.1063/1.362842
 M. A. Gaffar, A. A. El-Fadl and S. B. Anooz, “Influence of Strontium Doping on the Indirect Band Gap and Optical Constants of Ammonium Zinc Chloride Crystals,” Physica B: Condensed Matter, Vol. 327, No. 1, 2003, pp. 43-54. doi:10.1016/S0921-4526(02)01700-3
 C. P. Smyth, “Dielectric Behaviour and Structure,” Megraw Hill, New York, 1965.
 C. Balarew and R. Dehlew, “Application of the Hard and Soft Acids and Bases Concept to Explain Ligand Coordination in Double Salt Structures,” Journal of Solid State Chemistry, Vol. 55, No. 1, 1984, pp. 1-6.
 V. N. Joshi, “Photoconductivity,” Marcel Dekker, New York, 1990.
 R. H. Bube, “Photoconductivity of solids,” Wiley, New York, 1981.