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相关概念视频

Upsampling01:22

Upsampling

232
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
232

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相关实验视频

Updated: Jun 29, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

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在非线性元表面中退化自发的参数向下转换.

Tetsuyuki Ochiai

    Optics express
    |April 4, 2024
    PubMed
    概括

    我们介绍了一种使用非线性元表面的自发参数向下转换 (SPDC) 的简单方法. 这种技术利用半导体模式中的带交叉来提高SPDC的效率,通过第二和生成 (SHG) 建模得到证实.

    科学领域:

    • 非线性光学是一种非线性光学.
    • 在Metasurfaces上使用.
    • 光子学 是一个光子学.

    背景情况:

    • 自发参数向下转换 (SPDC) 是一个关键的量子光源.
    • 在紧结构中提高SPDC效率仍然是一个挑战.

    研究的目的:

    • 为高效的退化SPDC提出一个简单的方案.
    • 为了利用非线性元表面和准引导模式来增强光转换.

    主要方法:

    • 在偶数和奇数准平价导向模式之间采用带交叉.
    • 在SPDC转换效率中使用选择规则.
    • 通过非线性第二子生成 (SHG) 经典地评估效率.
    • 在非中心对称球体的单层中建模SPDC和SHG.

    主要成果:

    • 在非线性元表面中展示了SPDC的可行方案.
    • 通过拟议的方法,证实了SPDC效率的提高.
    • 玩具模型验证了方法的有效性.

    结论:

    • 拟议的计划提供了一个简单而有效的途径来加强SPDC.

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  • 带有准导向模式的非线性元表面对量子光产生有希望.
  • 通过SHG进行的经典评估提供了一种可靠的方法来预测SPDC性能.