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Atomic force microscope cantilever as focused GHz ultrasound transducer
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DOI：10.1016/j.jsv.2026.120034.png)
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Abstract
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• AFM tip focuses GHz ultrasound through natural horn-like geometry. • Tip echo amplitudes exceed geometric predictions by up to 150x between 20–50 GHz. • Mode conversion at the tip apex redistributes energy between longitudinal and transverse waves. • Optimized tip geometry potentially enhances acoustic transmission and imaging SNR. • Demonstrates AFM cantilevers as nanoscale GHz ultrasound transducers.
Keywords:
Atomic force microscopy
Picosecond ultrasonics
Photo-acoustics
Elastic wave propagation
Acoustic focusing
Mode conversion
Acoustic transducer
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