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相关概念视频

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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使用2光子聚合生成任意图案的偏振器的生成.

Byron Ganazhapa1,2, Javier Pereiro-García3, Xabier Quintana Arregui3

  • 1CEMDATIC, ETSI Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense 30, Madrid, 28040, Spain. b.ganazhapa@upm.es.

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概括

研究人员使用液晶和一种新的激光写字技术创建了有图案的偏振器. 这种方法精确地控制了先进光学设备的光极化.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 光学是什么?光学是什么?光学是什么?
  • 纳米技术纳米技术

背景情况:

  • 图案偏振器是各种光学和电子设备中的关键组件.
  • 在纳米尺度上控制液晶 (LC) 调整是制造高性能偏振器的关键.

研究的目的:

  • 为了展示使用双光子聚合直接激光写 (2PP-DLW) 进行LC对齐的图案偏振器的制造.
  • 为了评估使用负色调 (SU-8) 和正色调 (S1805) 光电阻剂制造的图案偏光器的性能.

主要方法:

  • 利用2PP-DLW创建纳米结构的LC对齐表面与高分辨率槽.
  • 用黑色二合色染料合液晶,并与线性偏振器相结合.
  • 通过传输测量和对比率分析评估了对齐质量和偏光器性能.

主要成果:

  • 实现了具有不同对比率 (CR) 和对齐均性的图案偏光器.
  • 与SU-8相比,S1805光电阻产生了更高的CR37和63%的均性 (CR14,均性65%).
  • 证明了2PP-DLW在亚微米图案和任意极化器设计方面的能力.

结论:

  • 2PP-DLW是一种多功能技术,用于制造任意图案的偏振器和其他LC设备.
  • 像S1805这样的正色光电阻体显示出对高性能二合色染料合LC对齐的承诺.
  • 这项研究强调了纳米尺度模式在先进光学元件制造中的潜力.