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相关概念视频

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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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相关实验视频

Updated: Jul 9, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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基于相变材料的芯片上多功能偏光器.

YuQian Long, Yedeng Fei, Yin Xu

    Applied optics
    |December 1, 2023
    PubMed
    概括

    本研究介绍了一种新型的多功能偏光器,使用抗化 Telluride (GSST) 在波导. 该设备通过切换GSST状态来提供可重新配置的横向电 (TE) 和横向磁 (TM) 偏振控制.

    科学领域:

    • 光子学和光学工程 光子学和光学工程
    • 材料科学 材料科学 材料科学
    • 纳米技术纳米技术

    背景情况:

    • 极化器是过光极化状态的关键光学元件.
    • 变相材料,如抗化 Telluride (GSST) 在光学系统中提供可重新配置的功能.
    • 光子学使小型化和集成光学设备成为可能.

    研究的目的:

    • 用GSST嵌入的波导来设计一个多功能极化器.
    • 为了实现可重新配置的横向电 (TE) 和横向磁 (TM) 通道功能.
    • 以灭火率 (ER) 和插入损失 (IL) 来评估设备的性能.

    主要方法:

    • 与GSST材料集成的波导的设计.
    • 利用晶体GSST的吸光特性.
    • 模拟分析极化器在波长为1550nm和波长范围内的性能.

    主要成果:

    • 实现了一种TE-pass偏振器,其灭火率 (ER) 为45.37dB,插入损失 (IL) 为1.10dB.
    • 实现了一个TM通极化器,其ER为20.09dB,IL为1.35dB.
    • 证明了广泛的带宽 (>200 nm TE-pass,~75 nm TM-pass) 与可接受的 ER 和 IL.

    更多相关视频

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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    结论:

    • 设计的基于GSST的波导极化器提供了多功能和可重新配置的极化控制.
    • 该设备表现出卓越的性能指标,包括高灭率和低插入损失.
    • 这项技术对需要动态极化管理的先进集成光学系统具有前景.