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Related Experiment Video

Updated: Dec 13, 2025

High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping

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Adaptive AFM scan speed control for high aspect ratio fast structure tracking.

Ahmad Ahmad¹, Andreas Schuh¹, Ivo W Rangelow¹

¹Department of Microelectronic and Nanoelectronic Systems, Faculty of Electrical Engineering and Information Technology Ilmenau University of Technology, Gustav-Kirchhoffstr. 1, 98684 Ilmenau, Germany.

The Review of Scientific Instruments

|November 3, 2014

Summary

This study introduces a new Atomic Force Microscope (AFM) imaging method. It enhances imaging speed by dynamically adjusting scan speed, improving topographic tracking without altering scanner dynamics.

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Area of Science:

Materials Science
Nanotechnology
Surface Science

Background:

Atomic Force Microscopy (AFM) is crucial for high-resolution surface imaging in life sciences and semiconductor analysis.
Current AFM systems face limitations in imaging speed due to mechanical constraints and low resonance frequencies, hindering the analysis of high-aspect-ratio samples.
Difficulty in tracking steep topographical features can lead to cantilever disengagement or collision, compromising image quality and acquisition speed.

Purpose of the Study:

To develop a novel approach for significantly increasing AFM imaging rates.
To improve the ability of AFM to accurately image samples with complex and high-aspect-ratio topographies.
To offer a simple and adaptable solution for enhancing AFM performance on standard systems.

Main Methods:

A new control strategy was implemented that dynamically adjusts the lateral scanning speed based on real-time control error signals.
The system monitors topographical changes and reduces scan speed only when necessary, allowing the z-piezo sufficient time to react.
This method avoids affecting the inherent scanner dynamics, focusing on adaptive speed control.

Main Results:

The novel approach allows for a significant increase in the overall imaging rate of Atomic Force Microscopes.
High and steep sample structures can be followed more effectively, reducing cantilever disengagement and sample crashes.
Smooth surface areas are scanned rapidly, while complex regions are navigated with optimized speed, eliminating the need for a fixed speed trade-off.

Conclusions:

The developed adaptive scanning speed control method offers a substantial improvement in AFM imaging efficiency.
This technique provides a practical and easily implementable solution for enhancing AFM performance without requiring modifications to scanner dynamics or z-piezo bandwidth.
The approach is highly beneficial for applications requiring fast and accurate imaging of challenging sample topographies.