Optoelectronic Imaging and Multimedia Technology IX 2023
DOI: 10.1117/12.2644013
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Continuous-zoom bifocal metalens at visible wavelength

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, foc… Show more

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