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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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非线性的中红外超膜.

Giovanni Sartorello1, Joshua Bocanegra2,3, David Knez4

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14850, USA.

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概括

独立的纳米光子元膜可以实现增强的非线性光学过程. 射击控制的第五波生成测量显示,在没有基板的碳化元膜中显著增强.

关键词:
metasurfaces 是一个地表.中等红外线中等红外线.非线性光学是一种非线性光学.碳化是碳化的重要组成部分.

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科学领域:

  • 纳米光子学 纳米光子学
  • 非线性光学是非线性光学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 纳米光子结构提供了对非线性光学过程的纳米控制.
  • 基板支的纳米结构限制了应用范围,并带来了散热挑战.
  • 评估独立的纳米结构的非线性光学特性是很困难的.

研究的目的:

  • 为了研究独立的纳米结构的非线性光学特性.
  • 展示用于增强非线性光学的无基质纳米光子架构.
  • 在碳化 (SiC) 甲膜中探索第五波生成 (FHG).

主要方法:

  • 在SiC元膜上进行射击控制的第五波生成 (FHG) 测量.
  • 背侧焦平面成像FHG衍射顺序.
  • 有限差异时间域 (FDTD) 模拟.
  • 用不同的共振位置进行一次性测量.

主要成果:

  • 与非结构化SiC薄膜相比,从SiC元膜获得的FHG增强至少有两倍.
  • 在中红外线 (λres ≈4,000 nm) 中显示出明显的光学共振.
  • 观察到不寻常的光谱行为,由克尔驱动的强度依赖共振动力学解释.

结论:

  • 开发了一种方法来评估独立的纳米结构的非线性光学特性.
  • SiC元膜表现出显著增强的FHG,使得无基质纳米光子应用成为可能.
  • 克尔驱动动力学对于理解共振纳米结构中观察到的光谱行为至关重要.