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相关概念视频

Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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基于metasurface的功能光学分离器用于空间并行双极化连贯调制器.

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    此摘要是机器生成的。

    我们开发了一种用于双极化相位和正方位调制器 (DP-IQM) 的新型介电元面. 这种表面正常装置集成了必不可少的被动光学元件,使高性能光学信号产生成为可能.

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    相关实验视频

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    科学领域:

    • 光子学和光学工程的工程.
    • 超材料和纳米光子学
    • 光学通信技术 光学通信技术

    背景情况:

    • 传统的双极化相位和正方位调制器 (DP-IQM) 需要复杂的被动光学组件.
    • 高效集成这些组件对于推进光通信系统至关重要.

    研究的目的:

    • 提出并演示使用介电元表面的表面正常双极化相位和正方位调制器 (DP-IQM).
    • 将基本的被动光学功能集成到一个单一的超表面层中.

    主要方法:

    • 设计和制造了一层由纳米柱组成的薄型介电超表面 (MS) 层.
    • 超表面被集成到高速电吸收调制器阵列中.
    • 进行了对极化和光束分裂功能的实验性表征.

    主要成果:

    • 超表面成功地集成了极化束分割器/组合器和干扰计电路功能.
    • 证明了极化和光束分裂,相位误差<0.08rad和功率失衡<0.9dB.
    • 在生成双极化四分位相位移键 (DP-QPSK) 和16方格振幅调制 (DP-16QAM) 信号时,实现了误差向量大小<7%.

    结论:

    • 拟议的表面正常DP-IQM使用介电超表面提供了一个紧而高效的解决方案.
    • 该设计允许可扩展的二维数组用于空间并行光信号生成.
    • 潜在的应用范围包括光通信,计算和传感.