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相关概念视频

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

257
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
257

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相关实验视频

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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活跃的多聚焦旋转束特拉赫兹编码元表面基于迪拉克半金属.

Huiyun Zhang, Xinyu Lv, Chunyang Jiang

    Applied optics
    |March 4, 2024
    PubMed
    概括

    研究人员使用迪拉克半金属开发了可调节的元表面,用于灵活的电磁波面操纵. 这些先进的材料可以动态控制太赫兹波,用于通信和成像应用.

    科学领域:

    • 超材料和纳米光子学
    • 凝聚物质物理学 凝聚物质物理学
    • 特拉赫兹技术的技术

    背景情况:

    • 电磁波线可以精确地使用具有离散相位编码的元表面来控制.
    • 超表面的动态可调性对于先进的波浪操纵应用至关重要.

    研究的目的:

    • 使用迪拉克半金属设计和演示动态调节的编码元面.
    • 探索1位和3位编码元面的功能,用于操纵太赫兹 (THz) 波.

    主要方法:

    • 设计了两种编码元表面 (1位和3位) 使用迪拉克半金属的活跃调.
    • 控制了迪拉克半金属的费米水平 (EF),并使用外部极化电压进行动态调节.
    • 在整个调整过程中保持不变的元表面大小和结构.

    主要成果:

    • 一位和三位元表面设计都表现出动态可调性.
    • 一位元表面展示了光束转换,单焦切换和单/多焦切换.
    • 3位元表面实现了束和单束镜像反射之间的切换.

    结论:

    • 拟议的可动态调节的迪拉克半金属基超表面为THz波调制提供了新的方法.

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  • 这些结构对于太赫兹通信和以太赫兹为重点的成像应用具有重大潜力.