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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.6K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.6K

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远程光学合与epsilon接近零的材料.

Danqing Wang1,2,3,4, Zheyu Lu5,6,7, Sorren Warkander8

  • 1College of Future Information Technology, Shanghai Engineering Research Centre of Ultra-precision Optical Manufacturing, Fudan University, Shanghai, China. danqingwang@fudan.edu.cn.

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研究人员使用epsilon-near-zero材料演示了远程光学相互作用,类似于量子道. 强烈的电磁场在薄膜中显示出反相关振荡,从而使新的光子应用成为可能.

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科学领域:

  • 光子学是指光子学的使用方法.
  • 量子光学是一种量子光学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 量子道可以通过波函数干扰来实现电子传输.
  • 发光合通常限制了薄膜中的光学相互作用.

研究的目的:

  • 为了证明对远程共振量子道的光学类比.
  • 为了探索超出 evanescent 合的相调光学相互作用.
  • 研究光通信和光子电路中的应用.

主要方法:

  • 在光学交互中使用epsilon近零 (ENZ) 材料.
  • 在ENZ薄膜中限制强烈的电磁场.
  • 在多层的氧化物中使用第二波生成探测场强度.

主要成果:

  • 氧化物层之间的远程光学相互作用达到数百微米.
  • 观察到封闭电磁场的反相关强度振荡.
  • 证明了低波长模式足迹与远程辐射合.

结论:

  • 恩兹材料能够实现类似于量子道的新型远程光学相互作用.
  • 观察到的现象为先进的光通信和大型光子系统提供了潜力.
  • 这项工作为混合量子光子系统铺平了道路.