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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 16, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

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

Published on: February 27, 2019

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基于液晶的电控宽带反射线性交叉偏振转换基于液晶.

Guangsheng Deng, Zhifei Kou, Aoran Guo

    Optics express
    |September 15, 2023
    PubMed
    概括

    本研究介绍了一种使用液晶的电调式太赫兹线性偏振转换器. 它为先进的光通信和成像应用程序动态控制交叉极化转换.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 材料科学 材料科学 材料科学
    • 电磁学 电磁学 电磁学 电磁学

    背景情况:

    • 太赫兹 (THz) 频率范围为极化控制带来了独特的挑战.
    • 传统的反射偏振转换器通常具有固定的,不可调节的响应.
    • 液晶 (LC) 为动态光学操纵提供了一个有前途的平台.

    研究的目的:

    • 设计和演示一个可电控的反射宽带线性极化 (LP) 转换器.
    • 在太赫兹范围内实现高效的交叉极化转换 (CPC).
    • 通过电压偏差来实现对极化状态的动态控制.

    主要方法:

    • 采用了一种新的结构,结合了阴性液晶 (LCs).
    • 采用电压偏差切换来重新定位LC分子.
    • 模拟并实验验证了THz频率范围内的设备性能.

    主要成果:

    • 实现了高极化转换比 (PCR) > 0.9.9.
    • 从236.8到269.6 GHz的宽带运行证明.
    • 通过切换LC状态来展示交叉极化和共极化反射波的动态控制.

    更多相关视频

    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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    Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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    Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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    相关实验视频

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    An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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    Published on: February 27, 2019

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    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
    07:03

    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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    Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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    Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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    结论:

    • 拟议的可电控的基于LC的LP转换器在THz范围内提供可调的CPC.
    • 动态控制超越了固定响应转换器的局限性.
    • 在THz成像和光通信领域有很大的应用潜力.