The present research is concentrated on improving the characteristic properties of salicylic acid (SA) within the nonlinear optical crystal. So, the layer-by-layer (LBL) technique was utilized to design and make thin films of nanosized aluminum (III) complex of 3-azo-phenolate salicylic acid (NS Al(III)-3AP-SA) having a high specified surface area with various thicknesses. The synthesized material was deposited on glass and quartz substrates to investigate the structural and optical properties. Characterization of fabricated films was performed using TGA, X-ray, SEM, and FTIR. The prepared NS Al(III)-3AP-SA exhibited a spherical shape with a size between 41–61 nm. The optical transmission spectra were studied in the spectral range of 300 to 1100 nm at room temperature. The refractive index, absorption coefficient, and optical energy gap were determined. It was found that the optical energy gap=3.78 eV without noticeable variation because of thickness increases. Together with their dependencies on the film thicknesses, the nonlinear and linear optical parameters have been calculated. The results suggest that the assembled NS Al(III)-(3AP-SA) can be categorized as a promising material for the fabrication of nonlinear optical crystal applications.

目前的研究集中在改善非线性光学晶体中水杨酸（SA）的特性。因此，采用逐层（LBL）技术设计并制备了具有高比重的3-偶氮酚盐水杨酸（NS Al（III）-3AP-SA）的纳米级铝（III）络合物的薄膜。具有各种厚度的表面积。合成的材料沉积在玻璃和石英基板上，以研究其结构和光学性能。使用TGA，X射线，SEM和FTIR对制成的膜进行表征。制备的NS Al（III）-3AP-SA呈球形，尺寸在41-61 nm之间。在室温下在300至1100 nm的光谱范围内研究了光透射光谱。折光率，吸收系数，确定了光能隙。已经发现，由于厚度的增加，光能隙＝ 3.78eV而没有明显的变化。连同它们对薄膜厚度的依赖性，已经计算出非线性和线性光学参数。结果表明，组装的NS Al（III）-（3AP-SA）可以归类为制造非线性光学晶体应用的有前途的材料。