AI 中文总结
研究通过多扫描飞秒激光写入控制本征模局域化和耦合各向异性，利用相邻扫描位移提供额外自由度，优化参数可减小编模面积、增快制造速度，调整几何结构降低耦合各向异性，用于特定波长三维波导阵列制造。
AI 中文摘要
多扫描方法广泛用于波导系统的飞秒激光写入，以提高折射率对比度并控制本征模形状。在此，我们研究了具有恒定有效写入速度的多扫描写入，并表明相邻扫描之间的位移为控制本征模限制提供了额外的自由度。通过优化多扫描参数，有效模式面积可以减小，与传统单扫描写入相比，制造速度可提高八倍。我们进一步证明，仔细调整多扫描几何结构可大幅降低波导间耦合的各向异性。这些发现应用于制造工作在808nm和1450nm波长的三维波导阵列，实现了降低耦合各向异性。所提出的方法可能对拓扑光子学实验中所需的低耦合各向异性的三维波导阵列有用。
英文摘要
The multiscan method is widely used in femtosecond laser writing of waveguide systems to increase the refractive index contrast and to control the eigenmode shape. Here, we investigate multiscan writing with a constant effective writing speed and show that the displacement between adjacent scans provides an additional degree of freedom for controlling eigenmode confinement. By optimizing the multiscan parameters, the effective mode area can be reduced, enabling an up to eightfold increase in fabrication speed compared to conventional single-scan writing. We further demonstrate that careful tuning of the multiscan geometry substantially reduces the anisotropy of inter-waveguide coupling. These findings are applied to the fabrication of three-dimensional waveguide arrays operating at wavelengths of 808 nm and 1450 nm, where reduced coupling anisotropy is achieved. The proposed approach may be useful for three-dimensional waveguide arrays employed in topological photonics experiments, where low coupling anisotropy is desired.
Comments11 pages, 9 figures
