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Atomic Force Microscopy

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays

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A monolithic MEMS position sensor for closed-loop high-speed atomic force microscopy.

N Hosseini¹, A P Nievergelt, J D Adams

¹Laboratory for Bio and Nano Instrumentation, School of Microengineering, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland.

|February 20, 2016

Summary

This summary is machine-generated.

High-precision atomic force microscopy (AFM) requires accurate piezoactuators. This study introduces a novel micro-sensor for closed-loop AFM nanopositioning, achieving distortion-free images at high speeds.

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Area of Science:

Nanotechnology
Surface Science
Microscopy

Background:

Atomic force microscopy (AFM) accuracy relies heavily on piezoactuator precision.
Piezoactuator nonlinearity distorts AFM images, necessitating closed-loop control.
High-speed AFM demands position sensors with higher bandwidth and lower mass.

Purpose of the Study:

To demonstrate high-speed, high-precision closed-loop AFM nanopositioning.
To introduce a novel, miniaturized micro-electro-mechanical system (MEMS) position sensor.
To enable distortion-free imaging for both conventional and high-speed AFM.

Main Methods:

Integration of a novel MEMS position sensor with a PID controller for closed-loop AFM operation.
Development of a miniaturized, lightweight sensor with high bandwidth and sub-nm resolution.
Testing the closed-loop system for conventional and high-speed AFM applications.

Main Results:

Achieved positioning precision down to 2.1 Å.
Reduced integral nonlinearity to below 0.2%.
Enabled accurate closed-loop imaging at line rates up to 300 Hz.

Conclusions:

The novel MEMS sensor facilitates high-speed, high-precision closed-loop AFM nanopositioning.
This approach overcomes limitations of traditional sensors for advanced AFM applications.
Distortion-free AFM imaging is achievable even at demanding line rates.