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薄膜的厚度、折射率和传输损耗等参数在电光系数的确定和光波导器件的设计和制作过程中都是重要的参考数据。采用旋涂法制备了三种不同质量比的偶氮化合物染料分散红13(DR13)与聚合物聚甲基丙烯酸甲酯(PMMA)复合薄膜;利用分光光度计测量样品的吸收光谱;利用棱镜耦合仪测量了薄膜的厚度和折射率,并对不同波长下的折射率进行拟合得到折射率色散曲线;采用视频摄像技术研究样品的光传输特性,利用自己编写的计算机程序来处理其实验结果。DR13/PMMA复合薄膜在300nm和500nm处有两个大的吸收峰,而在其他波段,尤其是在通信波段没有明显吸收。薄膜的膜厚大约为1~2μm,其折射率随着质量比的增加而增大,随着激光波长的增大而降低,膜厚和折射率的误差分别为3.2×10-1μm和1.5×10-3。三种质量比(10%,15%和20%)的薄膜传输损耗分别为1.5269dB/cm,2.7601dB/cm和3.6291dB/cm,可以看出随着DR13质量比的增大,光传输损耗也逐渐增大,即DR13的含量对于传输损耗的影响较大。
Film thickness, refractive index and transmission loss and other parameters in the determination of electro-optical coefficient and optical waveguide device design and production process are important reference data. Spin-coating method was used to prepare three kinds of composite film of azo compound Dye Disperse Red 13 (DR13) and polymer polymethylmethacrylate (PMMA) with different mass ratios. The absorption spectrum of the sample was measured by spectrophotometer. The thickness and refractive index of the films were measured and the refractive index dispersion curves were fitted by the refractive indices at different wavelengths. The video transmission technology was used to study the optical transmission characteristics of the samples, and the experimental results were processed by the computer programs written by ourselves. The DR13 / PMMA composite films have two large absorption peaks at 300nm and 500nm, but no obvious absorption at other bands, especially in the communication band. The film thickness is about 1 ~ 2μm, its refractive index increases with the increase of the mass ratio, with the increase of the laser wavelength decreases, the film thickness and refractive index error of 3.2 × 10-1μm and 1.5 × 10-3. The transmission losses of the films at three mass ratios (10%, 15% and 20%) were 1.5269dB / cm, 2.7601dB / cm and 3.6291dB / cm, respectively. It can be seen that as the mass ratio of DR13 increases, the optical transmission loss Also gradually increased, that is, the content of DR13 has a greater impact on transmission loss.