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采用K+-Na+交换技术制备了玻璃平面光波导,采用IWKB和逆分析转移矩阵相结合的方法,发现离子交换波导内部的折射率分布呈指数型。在理论上模拟出波导耦合角和包层物质折射率之间的变化关系曲线,用离子交换6、18和24h后形成的平面光波导进行传感实验,实验结果验证了波导的耦合角随液体包层折射率增加而增大的规律,并发现交换时间为6h形成的单模波导具有高的折射率传感灵敏度。该技术有望在微量液体折射率测量中得到应用。
The glass planar optical waveguide was prepared by K + -Na + exchange technique. The combination of IWKB and inverse analysis transfer matrix showed that the refractive index distribution in ion exchange waveguide was exponential. The relationship between the waveguide coupling angle and the refractive index of the cladding material was simulated in theory. The sensing experiments were carried out with planar optical waveguides formed after ion exchange for 6, 18, and 24 h. The experimental results verify that the coupling angle of the waveguide varies with the liquid The refractive index of the cladding increases with the increase of the law, and found that the exchange time of 6h formed single-mode waveguide with high refractive index sensing sensitivity. This technique is expected to find application in trace liquid refractive index measurements.