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Metasurface-integrated VCSEL and metalens cascade for line-shaped top-hat beam generation
Optics Express
|March 18, 2026
Summary
Researchers developed a compact optical system using a metasurface and a metalens to create line-shaped top-hat beams. This innovation offers improved efficiency and reduced divergence for applications like LiDAR and optical communications.
Area of Science:
- Optics and Photonics
- Metamaterials
- Laser Technology
Background:
- Line-shaped top-hat beams are crucial for laser processing, LiDAR, and photolithography.
- Existing beam-shaping methods are often bulky or difficult to fabricate.
Purpose of the Study:
- To propose a compact and efficient optical system for generating line-shaped top-hat beams.
- To overcome limitations of traditional beam-shaping devices.
Main Methods:
- An optically cascaded system integrating a Jones-matrix metasurface with vertical-cavity surface-emitting lasers (VCSELs) and a metalens was designed.
- The metasurface used geometric-phase and transmission-phase modulation to form a top-hat beam.
- A metalens converted the square top-hat beam into a line-shaped one.
Main Results:
- The system achieved a top-hat beam uniformity of 72%.
- A conversion efficiency of 80% was recorded.
- The line-shaped top-hat beam exhibited a reduced divergence angle of 0.17° along the y-axis.
Conclusions:
- The metasurface-integrated VCSEL cascaded with a metalens provides a compact and effective solution for generating line-shaped top-hat beams.
- This approach shows significant potential for optical communication, compact LiDAR, and integrated photonic systems.
