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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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Related Experiment Video

Updated: Feb 19, 2026

Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
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Contrast and imaging performance in photo induced force microscopy.

Mohammad Almajhadi, H Kumar Wickramasinghe

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    |November 3, 2017
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    Summary
    This summary is machine-generated.

    This study numerically analyzes Photo-induced Force Microscopy (PiFM) imaging. PiFM

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    Area of Science:

    • Near-field optical microscopy
    • Surface science
    • Spectroscopy

    Background:

    • Photo-induced Force Microscopy (PiFM) enables high-resolution imaging.
    • Understanding PiFM's performance limitations and capabilities is crucial for its application.
    • The role of optical forces in PiFM contrast and resolution requires further investigation.

    Purpose of the Study:

    • To numerically analyze the lateral and vertical (subsurface) imaging performance of PiFM.
    • To investigate the influence of excitation wavelength on spatial resolution.
    • To assess the magnitude of optical forces for molecular resonance detection.

    Main Methods:

    • Numerical simulation of PiFM performance in visible and IR regimes.
    • Analysis of field confinement near the tip apex.
    • Calculation of optical forces exerted on the tip due to sample molecular resonance.

    Main Results:

    • Lateral resolution and subsurface imaging are limited by wavelength-dependent field confinement.
    • Optical forces are within the detectable range and sensitive to molecular resonance.
    • Tip-coating thickness impacts gap-field enhancement, reducing it by ~40% for 5-35 nm.
    • IR force spectra correlate with the real part of polarizability, aligning with dipole-dipole approximation.

    Conclusions:

    • PiFM's resolution and subsurface capabilities are fundamentally linked to the excitation wavelength.
    • Molecular resonance significantly enhances contrast in PiFM imaging.
    • The study provides insights into optimizing PiFM for material characterization.