Neural network enabled wide field‐of‐view imaging with hyperbolic metalenses

Neural network enabled wide field‐of‐view imaging with hyperbolic metalenses

Nanophotonics

10.1515/nanoph-2025-0354

https://doi.org/10.1515/nanoph-2025-0354

Joel Yeo, Deepak K. Sharma, Saurabh Srivastava, Aihong Huang, Emmanuel Lassalle, Egor Khaidarov, Keng Heng Lai, Yuan Hsing Fu, N. Duane Loh, Arseniy I. Kuznetsov, Ramón Paniagua‐Domínguez

18 September 2025

Yeo, J., Sharma, D. K., Srivastava, S., Huang, A., Lassalle, E., Khaidarov, E., Lai, K. H., Fu, Y. H., Loh, N. D., Kuznetsov, A. I., & Paniagua‐Dominguez, R. (2025). Neural network enabled wide field‐of‐view imaging with hyperbolic metalenses. Nanophotonics, 14(20), 3329–3337. Portico. https://doi.org/10.1515/nanoph-2025-0354

The ultrathin form factor of metalenses makes them highly appealing for novel sensing and imaging applications. Amongst the various phase profiles, the hyperbolic metalens stands out for being free from spherical aberrations and having one of the highest focusing efficiencies to date. For imaging, however, hyperbolic metalenses present significant off‐axis aberrations, severely restricting the achievable field‐of‐view (FOV). Extending the FOV of hyperbolic metalenses is thus feasible only if these aberrations can be corrected. Here, we demonstrate that a Restormer neural network can be used to correct these severe off‐axis aberrations, enabling wide FOV imaging with a hyperbolic metalens camera. Importantly, we demonstrate the feasibility of training the Restormer network purely on simulated datasets of spatially‐varying blurred images generated by the eigen‐point‐spread function (eigenPSF) method, eliminating the need for time‐intensive experimental data collection. This reference‐free training ensures that Restormer learns solely to correct optical aberrations, resulting in reconstructions that are faithful to the original scene. Using this method, we show that a hyperbolic metalens camera can be used to obtain high‐quality imaging over a wide FOV of 54° in experimentally captured scenes under diverse lighting conditions.

Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

This research / project is supported by the A*STAR - Advanced Manufacturing and Engineering (AME) Programmatic Fund
Grant Reference no. : A18A7b0058

https://oar.a-star.edu.sg/communities-collections/articles/23412

2192-8614
2192-8614

Institute of Materials Research and Engineering

https://doi.org/10.1515/nanoph-2025-0354