Octave bandwidth aperiodic achromatic metalens in the infrared

Chunshu Li; Yuhao Guo; Yongjun Guo; Lin Zhang

doi:10.1117/12.2643928

4 January 2023 Octave bandwidth aperiodic achromatic metalens in the infrared

Chunshu Li, Yuhao Guo, Yongjun Guo, Lin Zhang

Proceedings Volume 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII; 1232205 (2023) https://doi.org/10.1117/12.2643928
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

With the rapid development of portable equipment, the demand for the miniaturization of optical elements is increasing. Metasurfaces are considered as potential planar analogs of conventional devices due to their small size and their extraordinary ability to modulate light. As one of the most important branches of metasurfaces, metalenses attract much attention and are fascinating to develop compact, miniature optical imaging devices. However, the highly chromatic characteristic limits their further applications. Therefore, achromatic metalenses with constant focal lengths over a broad bandwidth are highly desirable. Here, we demonstrate a diffraction-limited achromatic metalens with an octave-wide bandwidth in the infrared. Unlike typical metalenses with periodic unit cells, the proposed metalens comprises well-designed an aperiodic array of elements based on the Pancharatnam-Berry phase. The proposed metalens with a numerical aperture of 0.49 achieves an average focusing efficiency of 37% in a wavelength range from 1.15 to 2.3 μm, which is one octave, and maintains a near-constant focal length of 25 μm. It paves the way for miniaturized and broadband imaging applications.

Conference Presentation

Citation Download Citation

Chunshu Li, Yuhao Guo, Yongjun Guo, and Lin Zhang "Octave bandwidth aperiodic achromatic metalens in the infrared", Proc. SPIE 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII, 1232205 (4 January 2023); https://doi.org/10.1117/12.2643928

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