通过压力抑制动态障碍进行第二代切换
Dequan Jiang1, Xingxing Jiang2, Xue Zhang3
1School of Materials Science and Engineering, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|August 10, 2024
概括
研究人员通过动态障碍-顺序相转换在化物 (NH4Cl) 中发现了压力诱导的第二代 (SHG) 切换. 这种材料具有创纪录的可逆切换和独特的三重切换行为.
科学领域:
- 材料科学
- 晶体学
- 非线性光学
背景情况:
- 对于光学交换机和可比存储,第二声波代 (SHG) 开关至关重要.
- 温度诱导的相位转换已知用于SHG切换,但压力诱导的机制较少被探索,并且往往缺乏灵敏度.
- 开发具有可靠切换的压力敏感材料对于先进的光子设备至关重要.
研究的目的:
- 调查压力诱导的"动态失序"阶段转换,以触发NH4Cl中的SHG和SHG切换.
- 探索NH4Cl作为光学开关应用中的压力敏感材料的潜力.
- 了解压力驱动的SHG切换的基本机制及其周期性.
主要方法:
- 在现场高压X射线衍射 (XRD) 分析结构变化.
- 分子振动光谱和布里卢恩散射以研究相位过渡.
- 用光学光谱测量各种波长的SHG反应.
- 分子动力学模拟以阐明结的作用.
主要成果:
- 在1GPa时,NH4Cl表现出压力诱导的"动态失序"相变,触发SHG.
- 该材料显示可逆"关机"SHG切换最多50个周期,这是压力驱动材料的记录.
- 第二次SHG"开启-关闭"发生在14GPa,使得NH4Cl成为第一个三重SHG"开启-关闭"切换材料.
- 在压力诱导机制中,N-H··Cl结起着至关重要的作用.
结论:
- 压力诱导的"动态失序"阶段转换是NH4Cl中SHG切换的有效策略.
- 在压力下,NH4Cl具有高灵敏度,循环性和独特的多态切换行为.
- 这些发现为设计光学交换机和信息存储的新型多稳定SHG交换材料提供了洞察力.
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