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一个sub-2凯尔文低温磁特拉赫兹散射式扫描近场光学显微镜 (cm-THz-sSNOM)

R H J Kim¹, J-M Park¹, S J Haeuser¹

¹Ames National Laboratory, U.S. Department of Energy, Ames, Iowa 50011, USA and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

The Review of scientific instruments

|December 11, 2023

概括

研究人员开发了一种用于极端环境的新型低温磁特拉赫兹散射式扫描近场光学显微镜 (cm-THz-sSNOM). 这种工具可以在高磁场和超低温度下进行前所未有的量子材料纳米级成像.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
频谱学是一种光谱学.

背景情况:

研究量子材料通常需要极端条件,如低温和高磁场.
现有的纳米级成像技术在这种环境中面临局限性.
太赫兹 (THz) 光谱学为材料特性提供了独特的见解.

研究的目的:

开发一款多功能近场显微镜平台,可在低温和高磁场下运行.
为了证明一种新型的低温磁特拉赫兹散射类型扫描近场光学显微镜 (cm-THz-sSNOM) 的功能.
在极端条件下实现量子材料的纳米级成像和光谱.

主要方法:

开发一个定制的cm-THz-sSNOM仪器.
集成一个5T磁性冷静电机和一个定制插件.
使用超快速的THz激发和检测与一个femtosecond激光放大器.
执行低温磁铁THz时间域纳米光谱/成像.

主要成果:

成功演示了极端太赫兹 (THz) 纳米镜在低至1.8K的温度和高达5T的磁场下运行.
获得了第一个低温磁特THz时域纳米光谱/成像数据.
实现了对超导体和拓半金属的原则测量证明.

结论:

开发的cm-THz-sSNOM平台为纳米规模的研究提供了前所未有的能力.
这种仪器为在极端环境中研究量子材料开辟了新的途径.
允许使用纳米空间分辨率进行 femtosecond 时间分辨率和 THz 能量尺度的研究.

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