Continuous-zoom bifocal metalens at visible wavelength

Chang Wang; Qiangbo Zhang; Zeqing Yu; Xinyu Liu; Yang Zhang; Zhou Xu; Zhenrong Zheng

doi:10.1117/12.2644013

4 January 2023 Continuous-zoom bifocal metalens at visible wavelength

Chang Wang, Qiangbo Zhang, Zeqing Yu, Xinyu Liu, Yang Zhang, Zhou Xu, Zhenrong Zheng

Proceedings Volume 12317, Optoelectronic Imaging and Multimedia Technology IX; 123170B (2023) https://doi.org/10.1117/12.2644013
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

Metasurfaces and metalenses have drawn great attentions since they can manipulate wavefront versatilely with a miniaturized and ultrathin configuration. Here we propose and numerically verify a tunable bifocal metalens with two continuous-zoom foci. This device utilizes two cascaded and circle layers of metasurfaces with different phase distributions for incidences of opposite helicities imparted on each layer by the combination of geometric phase and propagation phase. By relative rotation of both layers, focal lengths of both foci can be tuned continuously with the zoom range for each focus designed deliberately, and the relative intensity of both foci can be adjusted by changing the polarization state of incidence. The proposed device is anticipated to be applied in polarization imaging, depth estimation, multi-plane imaging, optical data storage, and so on.

Conference Presentation

Citation Download Citation

Chang Wang, Qiangbo Zhang, Zeqing Yu, Xinyu Liu, Yang Zhang, Zhou Xu, and Zhenrong Zheng "Continuous-zoom bifocal metalens at visible wavelength", Proc. SPIE 12317, Optoelectronic Imaging and Multimedia Technology IX, 123170B (4 January 2023); https://doi.org/10.1117/12.2644013

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