为了在As2S8薄膜中制备条形波导,实验研究了As2S8薄膜光致折射率变化和密度变化的现象,采用棱镜耦合、X线衍射和远红外反射光谱等测试技术,确认了As2S8薄膜经紫外光辐照后薄膜密度增高、折射率增大的现象。采用可见光吸收谱测试技术,确认了经紫外光辐照的As2S8薄膜不发生黑化现象。在归纳了实验规律的基础上,提出并采用紫外光激励的方法试制了As2S8条形波导,采用自动调芯端面耦合的方法激励As2S8条形波导的导模,结果显示该波导具有良好的导波特性。

In order to fabricate As2S8 stripe waveguide, experimental study on photo-induced refractive index and density changes in As2S8 film is reported. It is found that the refractive index, and density of As2S8 film are enhanced after UV illumination throught testing techniques of prism coupling, X-ray diffraction spectrum and far-infrared spectra of reflection. The visible light absorption spectra of the As2S8 film sample shows that photodarkening does not occur after UV light irradiation. Based on study of these phenomena, UV illumination technique is presented and applied to As2S8 stripe waveguide preparation. This stripe waveguide of As2S8 displays nice characteristic of conducting beam using through guide mode excitation by means of automatic alignment and end-face coupling technique.