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Related Concept Videos

Atomic Force Microscopy01:08

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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Related Experiment Video

Updated: May 24, 2026

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
10:25

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

Published on: December 20, 2016

Spatial horizons in amplitude and frequency modulation atomic force microscopy.

Josep Font1, Sergio Santos, Victor Barcons

  • 1Departament de Disseny i Programació de Sistemes Electrònics, UPC-Universitat Politècnica de Catalunya, Av. Bases, 61, 08242 Manresa, Spain.

Nanoscale
|March 1, 2012
PubMed
Summary
This summary is machine-generated.

This study compares amplitude modulation (AM-AFM) and frequency modulation (FM-AFM) atomic force microscopy. It introduces spatial horizon to show both methods offer equivalent resolution for detecting atomic defects under ideal conditions.

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Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays for High-Throughput Large-Scale Sample Inspection

Published on: June 13, 2023

Area of Science:

  • Surface Science
  • Nanotechnology
  • Microscopy

Background:

  • Dynamic atomic force microscopy (AFM) offers nanoscale and atomic resolution by monitoring cantilever vibrations.
  • Amplitude modulation (AM-AFM) and frequency modulation (FM-AFM) are powerful AFM techniques, but their comparative resolution limits remain debated.

Purpose of the Study:

  • To quantitatively compare the resolution limitations of AM-AFM and FM-AFM.
  • To introduce and quantify the concept of spatial horizon (SH) as a resolution boundary.

Main Methods:

  • Introduction and quantification of the spatial horizon (SH) concept.
  • Comparative analysis of SH in AM-AFM and FM-AFM feedback systems.

Main Results:

  • FM-AFM can resolve single atoms or defects where AM-AFM might fail.
  • Relative contrast for detecting atomic features is equivalent between AM-AFM and FM-AFM.
  • Resolution equivalence is achieved if AM feedback detects small amplitude shifts and noise is absent.

Conclusions:

  • The spatial horizon concept provides a quantitative measure for comparing AFM resolution limits.
  • Under ideal conditions, AM-AFM and FM-AFM exhibit equivalent resolution for atomic-scale feature detection.
  • The choice between AM-AFM and FM-AFM may depend on experimental specifics rather than inherent resolution superiority.