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    科学领域:

    • 光子学和光学工程 光子学和光学工程
    • 纳米光子学 纳米光子学
    • 波导技术技术 波导技术

    背景情况:

    • 极化束分离器是各种应用的关键光学元件.
    • 现有的设备通常面临尺寸,带宽或性能方面的限制.
    • 像素波导为小型化和高性能光学设备提供了一种新的方法.

    研究的目的:

    • 设计和实验演示一个偏振光束分裂多模式波器.
    • 为了优化像素化的波导,使其具有紧的尺寸,宽带宽和高灭绝率.
    • 为了实现低插入损失和优秀的极化灭绝比.

    主要方法:

    • 使用有限差异时间域 (FDTD) 方法进行电磁波模拟.
    • 在波导设计中使用直接二进制搜索 (DBS) 优化算法.
    • 制造和实验性表征像素波导装置.

    主要成果:

    • 演示了一个极化光束分裂波器,设备长度只有15.4微米.
    • 实现的插入损失在横向电极化 (TE) 时<1.23dB,在横向磁极化 (TM) 时<0.74dB.
    • 获得的灭绝比率> 15.14 dB (TE) 和> 15.50 dB (TM),极化灭绝比率> 15.02 dB.
    • 该设备在广泛的波长范围内 (15201560 nm) 有效运行.

    结论:

    • 像素化的波导使得高效和紧的偏振光束分裂波器可以创建.
    • 展示的设备符合实际光学系统的关键性能指标.
    • 这项技术对集成光子学和光通信系统的进步具有前景.