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相关概念视频

Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...

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基于超低损耗Sb2Se3相变材料的超薄BIC元表面.

Zhaoyang Xie1, Chi Li1, Krishna Murali2

  • 1School of Physics and Astronomy, Faculty of Science, Monash University, Melbourne, Victoria 3800, Australia.

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概括

超薄,低损耗的相变材料使可调节的超表面成为先进的光子应用. 这些新型材料在近红外区域提供了高性能,为光学调制器和传感器铺平了道路.

关键词:
连续体中的有限状态.阶段变化元表面的变相变化.摄影发光光度调制可调节的地表表面.

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科学领域:

  • 光子学和材料科学 材料科学
  • 地元表面工程 表面工程
  • 纳米光子学 纳米光子学

背景情况:

  • 超薄,低损耗的相变材料 (PCM) 对于可重新配置的光子设备至关重要.
  • 传统的PCM呈现出高近红外 (NIR) 损失,阻碍了高质量因子 (Q-因子) 共振地表应用.
  • 需要先进的PCM来克服NIR共振元表面的这些局限性.

研究的目的:

  • 设计和制造连续性 (BIC) 超表面中的可调节束状态.
  • 为了利用超低损耗的PCM,胺化物 (Sb2Se3),提高地表性能.
  • 为了证明这些元表面在调节光发光的应用.

主要方法:

  • 使用Sb2Se3.3设计和制造25纳米厚的BIC元表面.
  • 在NIR中表征超表面调制深度和共振调.
  • 使用稀土添加的升级转化纳米粒子进行实验示范.

主要成果:

  • 在NIR中实现了高调制深度和广泛的共振调.
  • 通过超薄的BIC metasurfaces获得高Q因子,高达130个.
  • 证明了对多光子光发光的降低激发功率,并启用了排放偏振操纵.

结论:

  • 开发了一个有前途的平台,用于使用超低损失PCM的活跃共振元表面.
  • 制造的BIC超表面为光学调制,超快开关,色彩过和光学传感提供了显著的潜力.
  • 这项工作克服了NIR地区传统PCM在高Q共振应用中的局限性.