Design of bifocal metalens with extended depth of focus

Yaqi Ma; Fei Wu; Yishen Xu; Yan Ye

doi:10.1117/12.2686971

6 August 2023 Design of bifocal metalens with extended depth of focus

Yaqi Ma, Fei Wu, Yishen Xu, Yan Ye

Proceedings Volume 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023); 127810F (2023) https://doi.org/10.1117/12.2686971
Event: 2023 International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 2023, Guangzhou, JS, China

Abstract

The extended depth of focus (DOF) of optical systems can improve the longitudinal range of imaging. Although it is possible to achieve a stable extension of the focal depth by using the traditional Inverse Quartic Axicon (IQAX) with the Seidel spherical aberration, its large volume and bulky structure prevent its application in small integrated optical systems. In contrast, a metasurface, with a small volume, thin thickness, and flexible control of light waves, provides a wider range of applications as extended DOF lenses. We have here developed a bifocal metalens with a polarization-dependent extended DOF. By combining the Pancharatnam – Berry phase with the spatial multiplexing method, the incident left circularly polarized light and right circularly polarized light were then focused on different transverse positions. The here-designed bifocal metasurface lens, with its extended DOF, can be applied in areas like multi-channel information encryption, optical imaging and detection.

Citation Download Citation

Yaqi Ma, Fei Wu, Yishen Xu, and Yan Ye "Design of bifocal metalens with extended depth of focus", Proc. SPIE 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 127810F (6 August 2023); https://doi.org/10.1117/12.2686971

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