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用于原子分辨率扫描力显微镜的数字可调宽带幅度、相位和频率检测。

Digitally tunable, wide-band amplitude, phase, and frequency detection for atomic-resolution scanning force microscopy.

作者信息

Khan Z, Leung C, Tahir B A, Hoogenboom B W

机构信息

London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom.

出版信息

Rev Sci Instrum. 2010 Jul;81(7):073704. doi: 10.1063/1.3458009.

Abstract

Frequency-modulation atomic force microscopy (FM-AFM) relies on an accurate tracking of the resonance frequency of a scanning probe. It is now used in environments ranging from ultrahigh vacuum to aqueous solutions, for slow and for fast imaging, with probes resonating from a few kilohertz up to several megahertz. Here we present a versatile experimental setup that detects amplitude, phase, and frequency of AFM probes for resonance frequencies up to 15 MHz and with >70 kHz maximum bandwidth for amplitude/phase detection. We provide generic parameter settings for variable-bandwidth frequency detection and test these using our setup. The signal-to-noise ratio of the frequency detector is sufficiently high to record atomic-resolution images of mica by FM-AFM in aqueous solution.

摘要

调频原子力显微镜(FM-AFM)依赖于对扫描探针共振频率的精确跟踪。目前,它可用于从超高真空到水溶液等各种环境,适用于慢速和快速成像,探针的共振频率范围从几赫兹到几兆赫兹。在此,我们展示了一种通用的实验装置,该装置可检测高达15 MHz共振频率的AFM探针的振幅、相位和频率,并且振幅/相位检测的最大带宽大于70 kHz。我们提供了用于可变带宽频率检测的通用参数设置,并使用我们的装置对其进行测试。频率检测器的信噪比足够高,能够通过FM-AFM在水溶液中记录云母的原子分辨率图像。

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