Nanometer displacement measurement using Fresnel diffraction

Area of Science:

• Optical Metrology
• Nanotechnology
• Materials Science

Background:

• Accurate measurement of nanoscale displacement is crucial for various scientific and engineering applications.
• Existing techniques may be complex or lack the required sensitivity for certain applications.

Purpose of the Study:

• To introduce a simple and efficient optical technique for measuring nanoscale displacement.
• To demonstrate the technique's capability in measuring electromechanical and thermal expansion.
• To assess the potential sensitivity and applicability of the developed nanodisplacement probe.

Main Methods:

• Utilized visibility variations of Fresnel diffraction fringes from a two-dimensional phase step.
• Applied the technique to measure electromechanical expansion in a piezoelectric ceramic.
• Applied the technique to measure thermal diameter changes in a tungsten wire.

Main Results:

• Demonstrated a sensitivity up to a few nanometers.
• Successfully measured nanoscale displacements in both piezoelectric and thermal expansion scenarios.
• Validated the effectiveness of the optical technique for precise measurements.

Conclusions:

• The developed optical technique is a simple, efficient, and sensitive method for nanoscale displacement measurement.
• The technique shows significant potential for use as a versatile nanodisplacement probe.
• Further development could expand its applications in materials science and metrology.