Back-scattered detection provides atomic-scale localization precision, stability, and registration in 3D.

Area of Science:

• Nanotechnology
• Microscopy
• Surface Science

Background:

• Advanced microscopy techniques achieve atomic-scale precision.
• Sample drift is a significant limitation in achieving the full potential of these techniques.
• Precise sample positioning is crucial for high-resolution imaging and manipulation.

Purpose of the Study:

• To demonstrate a general 3D solution for active sample control using back-scattered detection (BSD).
• To overcome limitations imposed by sample drift in various microscopy applications.
• To enable stabilized scanning with uniform steps and high precision.

Main Methods:

• Utilized back-scattered detection (BSD) from a silicon disk on a cover slip for sample positioning.
• Implemented BSD in both air and water environments.
• Achieved precise localization and stabilization in x, y, and z axes.

Main Results:

• Demonstrated 19 pm lateral localization precision with low inter-axis crosstalk (
• Achieved atomic-scale stabilization (88, 79, and 98 pm in x, y, and z, respectively).
• Obtained sample registration of approximately 50 pm (rms) over 90 seconds using low laser power (1 mW).

Conclusions:

• Back-scattered detection (BSD) provides a precise method for local measurement and active control of sample position.
• This technique is applicable to diverse applications, particularly those with limited optical access like scanning probe microscopy and magnetic tweezers.
• BSD enables atomic-scale stabilization and registration, enhancing the capabilities of state-of-the-art microscopy.