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Fast topographic optical imaging using encoded search focal scan.

Narcís Vilar^1,2, Roger Artigas¹, Martí Duocastella³

¹Sensofar Tech S.L, Parc audiovisual de Catalunya, BV-1274 km 1, 08225, Terrassa, Spain.

Nature Communications

|March 7, 2024

Summary

This summary is machine-generated.

This study introduces a novel topographic imaging method that significantly accelerates measurements by using modulated illumination and fewer images. This breakthrough enables real-time, high-speed 3D surface mapping of dynamic samples.

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Area of Science:

Optics and Photonics
Metrology
Surface Science

Background:

Topographical imaging is crucial for micro/nanoscale measurements in precision engineering and quality control.
Current methods require time-consuming focal stacks, limiting measurements to static samples.
Rapid quantitative information extraction from samples remains a central challenge in optics.

Purpose of the Study:

To develop a significantly faster method for topographic imaging.
To enable real-time characterization of dynamic and large-scale samples.
To overcome the limitations of conventional focal stack-based imaging techniques.

Main Methods:

A novel approach using a reduced set of images, each integrated during a full focal scan.
Synchronous modulation of illumination during image exposure.
Unambiguous reconstruction of object height maps via designed modulation sequences.

Main Results:

Achieved orders of magnitude increase in topographic imaging speed.
Demonstrated sub-micrometric topographic imaging over a 100 µm range.
Reached imaging rates as high as 67 topographies per second for static and dynamic systems.

Conclusions:

The proposed technique offers a paradigm shift in optical metrology.
High-speed, real-time characterization of moving samples is now feasible.
Ease of implementation and speed make this method broadly applicable.