高动态范围扫描道显微镜

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Ajla Karić¹, Carolina A Marques¹, Berk Zengin¹

¹Department of Physics, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland.

|August 6, 2024

概括

我们通过积极去除当前波器来增强扫描道显微镜 (STM) 的动态范围. 这种方法可以防止预放大器和,使得高准确度光谱和成像能够在没有硬件修改的情况下进行.

科学领域:

物理物理学物理
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

扫描道显微镜 (STM) 对于纳米级成像和光谱学至关重要.
电流-电压特征中的非线性产生电流波.
这些波可以和预放大器,限制STM测量的动态范围,特别是在低阻抗或高增益时.

研究的目的:

增加扫描道显微镜 (STM) 的动态范围.
为了克服由当前波引起的预放大器和问题.
为了在STM中实现高动态范围光谱和成像.

主要方法:

积极减去由非线性产生的主导电流波.
利用激发电压和电流和之间的相位关系进行取消.
在预放大器输入处使用补偿电容以通过位移电流取消波.
使用两个相同步电压源和一个多频锁定放大器.

主要成果:

成功取消占主导地位的电流和.
防止当前预放大器和.
证明 DC 电流的去除没有任何效果,而第一的去除会导致差电导率的可逆转移.
实现了高动态范围光谱和成像.

结论:

开发的方法有效地扩大了STM的动态范围.
活跃波减去是提高STM性能的一种可行的技术.
这种方法需要最小的硬件更改,依赖于同步的电压源和锁定放大.

关键词:

活动功率过器活动功率过器放大器和度的增强器带结构带结构国家密度的密度.动态范围动态范围高动态范围扫描道显微镜扫描道显微镜的扫描方法扫描道光谱学扫描道光谱

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