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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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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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High-sensitivity dynamic detection by tapping-mode nanomechanical sensing using an all-fiber microcantilever probe.

Famei Wang, Changrui Liao, Liping Hou

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    |December 1, 2025
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    Summary

    This study introduces a novel dynamic microforce sensor using a fiber-optic microcantilever for atomic force microscopy (AFM). It achieves pN-level force detection, enabling precise microscale material characterization.

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    Area of Science:

    • Microscale material characterization
    • Nanotechnology
    • Sensor development

    Background:

    • Precise microscale material characterization is crucial for advancements in various scientific fields.
    • Existing sensor technologies often face limitations in sensitivity and resolution for microscale applications.

    Purpose of the Study:

    • To develop and characterize a novel dynamic microforce sensor.
    • To integrate a fiber-optic microcantilever probe for tapping-mode atomic force microscopy (AFM).

    Main Methods:

    • Femtosecond laser two-photon polymerization (TPP) nanolithography to fabricate microstructure cantilever beam probes on fiber end faces.
    • Finite element analysis (FEA) for determining dynamic mechanical properties and optimizing the microcantilever structure.
    • Parametric modeling for sensor optimization.

    Main Results:

    • Achieved a microforce sensitivity of 103 Hz/nm.
    • Obtained a quality factor (Q) of 326.98.
    • Demonstrated a pN-level force detection limit, approximately 17 pN.

    Conclusions:

    • The developed dynamic microforce sensor offers high sensitivity and a low detection limit for microscale force measurements.
    • Its simple structure and parallel probe configuration make it highly promising for applications in quantitative analysis of soft materials and biological samples.