The Growth and the Optical, Mechanical, Dielectric and Photoconductivity Properties of a New Nonlinear Optical Crystal—L-Phenylalanine-4-nitrophenol NLO Single Crystal

S. Suresh
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引用次数: 22

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 (er) and imaginary (ei) 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.
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一种新型非线性光学晶体- l -苯丙氨酸-4-硝基苯酚NLO单晶的生长及其光学、力学、介电和光电导性能
采用慢蒸发法制备了l -苯丙氨酸-4-硝基苯酚非线性光学单晶。对生长的晶体进行单晶x射线衍射分析,确认其属于单斜晶结构,空间群为P21。光透射研究表明,晶体在整个可见光区域都是透明的,截止波长为320 nm。光学带隙为3.87 eV。利用l -苯丙氨酸-4-硝基苯酚晶体的透射率计算了晶体的折射率(n)、消光系数(K)和介电常数的实部和虚部(ei)。用维氏显微硬度计研究了生长晶体的力学行为。在50 Hz ~ 5 MHz的频率范围内,测量了l -苯丙氨酸-4-硝基苯酚在不同温度下的介电常数和介电损耗。光导研究证实了样品的负光导性质。
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