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Related Experiment Video

Updated: Sep 15, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Phase-Shifting Structured Illumination with a Polarization-Encoded Metasurface.

Linzhi Yu¹, Jesse Pietila¹, Haobijam Johnson Singh¹

¹Department of Physics, Tampere University, 33720 Tampere, Finland.

|July 17, 2025

Summary

This summary is machine-generated.

Researchers developed a compact metasurface for phase-shifting structured illumination, enabling robust 3D surface measurement. This polarization-controlled device offers a stable, integrated solution for optical metrology and computational imaging applications.

Keywords:

3D measurement fringe projection profilometry metasurfaces phase-shifting structured illumination

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Area of Science:

Optics and Photonics
Metrology
Materials Science

Background:

Phase-shifting structured illumination is crucial for advanced imaging techniques like 3D surface measurement.
Conventional methods often involve complex, bulky mechanical or optoelectronic systems, hindering practical applications.
There is a need for compact, stable, and integrated solutions for generating structured light patterns.

Purpose of the Study:

To introduce a novel polarization-controlled dielectric metasurface for generating phase-shifting fringe patterns.
To demonstrate a compact and robust structured light projection system.
To enable efficient 3D surface measurement using the developed metasurface.

Main Methods:

Design and fabrication of a polarization-controlled dielectric metasurface.
Encoding distinct phase gratings for orthogonal polarizations to create lateral fringe displacements.
Experimental demonstration of fringe generation and application in fringe projection profilometry for 3D surface measurement.

Main Results:

Successful generation of high-quality phase-shifting fringe patterns in the visible spectrum.
Demonstration of a compact, millimeter-scale metasurface device.
Accurate 3D surface measurement of objects using the metasurface-based structured illumination system.

Conclusions:

The polarization-controlled dielectric metasurface provides a compact, passive, and robust solution for structured light generation.
This technology integrates multiple phase-shifting steps into a single static device.
The approach has broad potential for optical metrology, computational imaging, and other applications requiring structured illumination.