Ponnampalam N, Decorby R, Nguyen H, Dwivedi P, Haugen C, McMullin J, Kasap S
Opt Express. 2004 Dec 13;12(25):6270-7. doi: 10.1364/opex.12.006270.
Low-loss shallow-rib waveguides were fabricated using As2Se3 chalcogenide glass and polyamide-imide polymer. Waveguides were patterned directly in the As2Se3 layer by photodarkening followed by selective wet etching. Theory predicted a modal effective area of 3.5-4 microm2, and this was supported by near-field modal measurements. The Fabry-Perot technique was used to estimate propagation losses as low as ~0.25 dB/cm. First-order Bragg gratings near 1550 nm were holographically patterned in some waveguides. The Bragg gratings exhibited an index modulation on the order of 0.004. They were used as a means to assess the modal effective indices of the waveguides. Small core As2Se3 waveguides with embedded Bragg gratings have potential for realization of all-optical Kerr effect devices.
采用As2Se3硫系玻璃和聚酰胺 - 酰亚胺聚合物制备了低损耗浅肋波导。通过光暗化随后进行选择性湿法蚀刻，在As2Se3层中直接对波导进行图案化。理论预测模式有效面积为3.5 - 4平方微米，这得到了近场模式测量的支持。采用法布里 - 珀罗技术估计传播损耗低至约0.25 dB/cm。在一些波导中通过全息图案化形成了近1550 nm的一阶布拉格光栅。布拉格光栅表现出约0.004量级的折射率调制。它们被用作评估波导模式有效折射率的一种手段。带有嵌入式布拉格光栅的小芯径As2Se3波导具有实现全光克尔效应器件的潜力。
