Detection of picometer scale vibration based on the microsphere near-field probe

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We introduce an innovative vibration detection method utilizing a microsphere near-field probe, affixed to an optical fiber probe. Notably, when the microsphere probe is positioned at a distance of approximately 100 nm from the vibrating objects, it exhibits a substantial increase in detection sensitivity, enabling the detection vibration as small as 5 pm. This enhancement arises from the strong near-field interaction between the sample and probe, where the evanescent wave dominates. This effect is confirmed for the first-time through both theoretical
analysis and experimental validation. This innovative probe has great potential for applications in cellular acoustics, vibrational detection of biomolecules and their complexes, in situ measurements, and imaging of microstructures and nanostructures.
Original languageEnglish
Article number115892
JournalMeasurement
Volume242
Issue numberPart A
Early online date9 Oct 2024
DOIs
Publication statusE-pub ahead of print - 9 Oct 2024
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