Astigmatic Displacement Microscopy (ADM) with Subnanometer Axial Resolution for Three-Dimensional (3D) Morphological...

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology
• Optical Microscopy

Background:

• Growing demand for advanced micro/nano characterization techniques.
• Limitations of existing methods in materials and surface-interface sciences.
• Need for high-resolution, non-destructive imaging tools.

Purpose of the Study:

• To develop and report a highly sensitive astigmatism displacement microscopy (ADM) system.
• To achieve subnanometer axial resolution for optical 3D imaging.
• To demonstrate the capability of ADM for large-area characterization with exceptional imaging quality.

Main Methods:

• Development of a novel astigmatism displacement microscopy (ADM) system.
• Utilizing low-power, noncontact, and nondestructive optical 3D imaging.
• Application of ADM for characterizing various nanoscale materials.

Main Results:

• Achieved subnanometer axial resolution (0.1 nm) with the ADM system.
• Demonstrated high-quality 3D morphology characterization of Au nanoplates, CD-ROMs, Si wafers, and few-layer 2D materials (e.g., MoS2).
• Showcased linear capability to resolve atomic layer numbers in 2D materials and characterized transparent single crystals.

Conclusions:

• The developed ADM system is a powerful tool for micro/nanoscale characterization.
• ADM offers significant implications for advancing materials and surface-interface research.
• The technique enables rapid, high-quality, non-destructive 3D imaging of diverse nanoscale structures.