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All dielectric highly efficient achromatic meta-lens using inverse design optimization.

Abdullah Maher¹, Mohamed A Swillam²

¹Department of Physics, The American University in Cairo, New Cairo, 11835, Egypt.

Scientific Reports

|November 2, 2023

Summary

This study introduces a novel achromatic meta-lens designed using topology optimization. The meta-lens achieves high focusing efficiency across a broad wavelength range for multiple high numerical apertures.

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Area of Science:

Optics and Photonics
Metamaterials
Computational Design

Background:

Achromatic meta-lenses are crucial for advanced optical systems, but achieving broadband high efficiency remains challenging.
Inverse design and topology optimization offer powerful tools for designing complex optical nanostructures.

Purpose of the Study:

To develop a high-efficiency achromatic meta-lens using topology optimization.
To demonstrate broadband focusing performance across a wide wavelength range and high numerical apertures.

Main Methods:

Utilized inverse design with topology optimization methodology for meta-lens design.
Employed Kreisselmeier-Steinhauser (k-s) objective function for optimization.
Validated performance using a direct solver across the 400-800 nm wavelength band.

Main Results:

Achieved high focusing efficiency for achromatic meta-lenses with numerical apertures (NA) of 0.7, 0.8, and 0.9.
Demonstrated stable performance over the broadband wavelength range of 400-800 nm.
The optimized designs exhibited consistent high efficiency under various high NA conditions.

Conclusions:

Topology optimization is effective for designing high-performance achromatic meta-lenses.
The developed meta-lenses offer broadband achromatic performance suitable for demanding optical applications.
This approach enables the creation of compact, efficient optical components with tailored functionalities.