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

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Subwavelength imaging with a zero-mass sonic meta-atom.

Thibaut Devaux^1,2, Eun Bok^3,4, Jong J Park⁵

¹Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan.

Science Advances

|March 4, 2026

Summary

This summary is machine-generated.

This study introduces a novel acoustic imaging platform using a sonic meta-atom probe. It achieves super-resolved imaging by capturing evanescent waves, enabling detailed texture analysis and non-contact scanning.

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Area of Science:

Acoustics
Metamaterials
Nanotechnology

Background:

Acoustic metamaterials enable sound manipulation at subwavelength scales.
Super-resolved acoustic imaging requires accessing evanescent waves beyond the diffraction limit.
Near-field techniques with subwavelength probes capture evanescent waves for fine object detail.

Purpose of the Study:

Introduce an experimental platform for super-resolved acoustic imaging.
Utilize airborne extraordinary transmission to couple evanescent acoustic waves.
Develop a subwavelength, zero-mass sonic meta-atom probe.

Main Methods:

Harnessing airborne extraordinary transmission to couple evanescent waves.
Employing a sonic meta-atom probe with a circular membrane on a waveguide tip.
Exploiting the sonic Drexhage effect for resonant frequency downshift.

Main Results:

Demonstrated extreme subwavelength imaging by measuring the waveguide's acoustic reflection coefficient.
Achieved lateral resolution of approximately [Formula: see text] and depth resolution of approximately [Formula: see text].
Showcased capabilities for texture measurement and non-contact scanning.

Conclusions:

The developed platform enables extreme subwavelength acoustic imaging.
The sonic meta-atom probe effectively captures evanescent waves for high-resolution imaging.
The technology offers advanced capabilities for material characterization and scanning.