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Aliasing suppression of GaN-based homogeneous circular polarizer monolithically compatible with surface-emitting
Optics Express
|June 14, 2025
Summary
This study presents a novel GaN metasurface acting as a homogeneous circular polarizer. It efficiently converts and separates circularly polarized light, offering potential for integrated optical devices.
Area of Science:
- Materials Science
- Optics and Photonics
- Nanotechnology
Background:
- Metasurfaces offer advanced control over light polarization.
- Developing efficient and polarization-insensitive circular polarizers is crucial for integrated optics.
Purpose of the Study:
- To design and fabricate a single-layer homogeneous circular polarizer (HCP) metasurface using Gallium Nitride (GaN).
- To achieve polarization-insensitive operation and efficient conversion of linear to circular polarization.
Main Methods:
- Design of a GaN-based metasurface with a specific phase gradient.
- Fabrication using GaN epitaxy.
- Experimental characterization of polarization conversion and efficiency.
Main Results:
- The metasurface demonstrates insensitivity to incident linear polarization angle.
- Achieved an average degree of circular polarization of 0.95 (simulated) and 0.88 (experimental).
- Obtained average power efficiency of 50% (simulated) and 40% (experimental).
Conclusions:
- The developed GaN metasurface functions as an effective homogeneous circular polarizer.
- Its polarization-insensitivity makes it suitable for monolithic integration with lasers.
- Potential applications include backside integration on surface-emitting lasers for advanced optical functionalities.
