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Related Experiment Video

Updated: May 22, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Beam Shaping by Stacked Nonlinear Moiré Metasurfaces.

Lun Qu¹, Wei Wu¹, Di Zhang^1,2

¹The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Institute of Applied Physics, Nankai University, Tianjin 300071, China.

|March 13, 2025

Summary

Researchers developed a novel nanofabrication technique for stacked nonlinear moiré metasurfaces. This method enables precise control over twist angles, leading to tunable optical functionalities for advanced photonic applications.

Keywords:

Far-field radiation Lithium niobate Moiré metasurfaces Nanofabrication Reciprocal lattice Second harmonic generation

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Last Updated: May 22, 2025

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Area of Science:

Photonics and Nanotechnology
Nonlinear Optics
Metasurface Engineering

Background:

Moiré phenomena offer tunable lattices for photonics research.
Fabricating stacked moiré metasurfaces presents significant challenges.
Existing methods limit control over interlayer twist angles and functionalities.

Purpose of the Study:

To introduce an innovative nanofabrication approach for stacked nonlinear moiré metasurfaces.
To enable precise control over interlayer twist angles for momentum space engineering.
To demonstrate simultaneous frequency conversion and wavefront manipulation.

Main Methods:

Utilized a focused ion beam-assisted nanostructure transfer-welding technique.
Developed a method for precise control over interlayer twist angles in stacked metasurfaces.
Investigated nonlinear optical properties, specifically second-harmonic generation.

Main Results:

Successfully fabricated stacked nonlinear moiré metasurfaces with controlled twist angles.
Observed intricate, tunable far-field second-harmonic radiation patterns.
Demonstrated the capability for simultaneous frequency conversion and wavefront manipulation.

Conclusions:

The developed nanofabrication technique overcomes key fabrication challenges in nonlinear photonics.
Precise control of twist angles in moiré metasurfaces enables tunable optical responses.
This advancement opens new possibilities for nonlinear information processing, optical steering, and switching.