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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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Optical lever calibration in atomic force microscope with a mechanical lever.

Hui Xie¹, Julien Vitard, Sinan Haliyo

¹Institut des Systèmes Intelligents et Robotique (ISIR), Université Pierre et Marie Curie-Paris, 6/CNRS 18Route du Panorama-BP 61, 92265 Fontenay-Aux-Roses, France.

The Review of Scientific Instruments

|December 3, 2008

Summary

A new mechanical lever precisely calibrates atomic force microscope (AFM) optical lever lateral sensitivity. This method accurately converts translation to rotation for reliable nanoscale measurements without altering AFM hardware.

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Area of Science:

Nanotechnology
Metrology
Surface Science

Background:

Atomic Force Microscopy (AFM) is crucial for nanoscale imaging and measurements.
Accurate calibration of the optical lever's lateral sensitivity is essential for reliable AFM data.
Existing calibration methods can be complex or require modifications to the AFM setup.

Purpose of the Study:

To develop a novel, direct calibration method for the lateral sensitivity of an AFM's optical lever.
To provide an accurate conversion between photodiode voltage and cantilever torsional angle.
To enable local and full-range lateral sensitivity calibration without altering the AFM or cantilevers.

Main Methods:

A novel mechanical lever with a flexible hinge was designed to convert linear motion into nanoscale rotational angles.
The AFM cantilever was mounted on a holder attached to the mechanical lever, aligning their axes.
Calibration was performed using the device's Z-axis nanomotion and external controlled motion.

Main Results:

The mechanical lever successfully achieved direct calibration of the optical lever's lateral sensitivity.
An accurate conversion between photodiode voltage output and cantilever torsional angle was established.
The method allowed for both local and full-range lateral sensitivity calibrations.

Conclusions:

The developed mechanical lever offers a direct, accurate, and non-invasive method for calibrating AFM optical lever lateral sensitivity.
This technique enhances the reliability and precision of nanoscale measurements performed with atomic force microscopes.
The approach simplifies the calibration process, making high-accuracy AFM operation more accessible.