Atomic force microscope scanning head with 3-dimensional orthogonal scanning to eliminate the curved coupling

Area of Science:

• Metrology
• Nanotechnology
• Surface Science

Background:

• Atomic Force Microscopy (AFM) is crucial for nanoscale measurements.
• Traditional AFM designs can suffer from curvature distortion and cross-coupling errors.
• Accurate metrology requires minimizing these distortions for precise surface characterization.

Purpose of the Study:

• To design and validate an AFM scanning head for metrological applications.
• To eliminate curvature distortion and cross-coupling errors in AFM measurements.
• To achieve high resolution and accuracy in nanoscale surface profiling.

Main Methods:

• Developed an AFM scanning head employing an orthogonal scanning mode.
• Integrated a piezostage for precise probe movement in three orthogonal directions.
• Implemented a novel optical lever amplification system to minimize coupling errors.
• Operated the AFM in contact mode for surface interaction analysis.

Main Results:

• The orthogonal scanning mode effectively eliminated curvature distortion.
• The integrated tracing lens and probe tip design reduced coupling errors.
• Analysis of the step approach process demonstrated robust performance.
• The AFM probe head achieved a resolution of 0.5 nm in the z-direction.
• Planar scanning performance was validated against traditional tube scanning AFM.

Conclusions:

• The novel AFM scanning head design significantly enhances metrological accuracy.
• Orthogonal scanning and advanced optical systems are key to minimizing AFM measurement errors.
• The demonstrated 0.5 nm resolution opens possibilities for advanced nanoscale metrology.