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相关概念视频

Types of Semiconductors01:20

Types of Semiconductors

579
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
579
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

235
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...
235

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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在无形碳化波导中强烈的第三阶非线性.

Yaoqin Lu, Xiaodong Shi, Adnan Ali Afridi

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    概括
    此摘要是机器生成的。

    无形碳化 (a-SiC) 薄膜对光子设备具有前景. 增加a-SiC的折射率提高了其非线性特性,为芯片上的光学应用提供了比更广泛的带隙替代品.

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    科学领域:

    • 材料科学 材料科学 材料科学
    • 光子学是指光子学的使用方法.
    • 非线性光学是非线性光学.

    背景情况:

    • 碳化 (SiC) 是光子集成电路的一个有前途的材料,由于其优良的光学性能.
    • 在绝缘体 (a-SiCOI) 上的无形碳化 (a-SiC) 薄膜可用于晶圆尺度的光子应用.
    • a-SiC提供比更宽的带隙,可能减少两个光子的吸收.

    研究的目的:

    • 调查a-SiC薄膜中折射率和非线性特性之间的关系.
    • 评估a-SiC作为高性能芯片内光学应用的材料.
    • 为了比较a-SiC与和晶体SiC的非线性性能.

    主要方法:

    • 使用等离子体增强化学蒸气沉积制造具有不同折射率的三个a-SiCOI样本.
    • 在a-SiCOI样本上制造光学波导.
    • 使用四波混合测量的非线性折射率的表征.

    主要成果:

    • a-SiC的折射率的增加与增强的非线性折射率直接相关.
    • a-SiC的非线性折射率与的折射率相当.
    • a-SiC的折射率更高,非线性比晶体SiC更强.

    结论:

    • 无形碳化是开发先进光子集成电路的可行材料.
    • 与相比,a-SiC提供了一个可调节的平台,具有卓越的非线性光学性能和更宽的带隙.
    • 这项研究为基于SiC的新型光子设备铺平了道路,使光学损失最小化.