Achieving Achromatic and Misalignment-Tolerant Fiber Coupling via Meta-Lens with Structural Interleaving

Area of Science:

• Optics and Photonics
• Metamaterials
• Optical Engineering

Background:

• Laser-lens-fiber coupling systems often suffer from chromatic aberration and off-axis collimation issues.
• These aberrations limit the efficiency and precision of optical systems.

Purpose of the Study:

• To design a meta-lens that overcomes chromatic aberration and off-axis collimation challenges.
• To enhance the performance and robustness of laser-lens-fiber coupling systems.

Main Methods:

• Developed a chromatic aberration-corrected meta-lens using particle swarm optimization and structural interleaving.
• Incorporated wavelength-dependent phase factors into an optimization model.
• Integrated multiple phase distributions onto a single meta-surface using structural interleaving.

Main Results:

• Achieved achromatic performance with a focal length standard deviation below 0.4 μm in the 1260-1360 nm band.
• Maintained coupling efficiency fluctuation within 8% over a ±1 μm off-axis displacement.
• Demonstrated a phase matching efficiency of 95.2%.

Conclusions:

• The proposed meta-lens design effectively addresses phase quantization and dispersion matching challenges.
• This method offers a feasible solution for engineering robust meta-lenses in high-precision optical systems.
• The results pave the way for advanced applications in optical communication and sensing.