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Area of Science:

Physics
Optical Engineering
Materials Science

Background:

Shear-force microscopy (SFM) is a key technique for nanoscale imaging.
Accurate measurement of lateral oscillation amplitudes is crucial for SFM performance.
Existing methods for measuring these amplitudes have limitations in sensitivity and ease of use.

Purpose of the Study:

To introduce a novel, highly sensitive technique for measuring lateral oscillation amplitudes of optical fibers on the nanometer scale.
To demonstrate the implementation and advantages of this technique for shear-force microscopy applications.

Main Methods:

The developed measurement system utilizes the optical fiber tip as a cylindrical lens.
This configuration focuses and deflects a detection beam to measure oscillations.
A simple geometric model is employed to describe the system's operational principles.

Main Results:

The described technique offers at least 2.5 times greater sensitivity compared to conventional shadowing methods.
Oscillation amplitudes as small as 2-3 nanometers can be readily measured.
The system facilitates straightforward measurement of absolute vibration amplitudes.

Conclusions:

This technique provides an easy-to-implement and highly sensitive approach for nanometer-scale lateral oscillation measurements in SFM.
The ability to measure absolute vibration amplitudes offers significant advantages for precise nanoscale investigations.