Polarization-enabled tunable focusing by visible-light metalenses with geometric and propagation phase

Flat metalenses with tunable focal length have wide applications in modern optical systems with high integration requirement. Here, by combining propagation phase and geometric phase, we numerically realize a metalens with a tunable focal length by controlling the polarization state of incident light. The tuning range can be as large as 15λ at the designer wavelength. Furthermore, the tunable performance can operate at the entire visible band with an efficiency over 35%. We believe that the proposed polarization-enabled tunable focusing metalens will find significant applications in imaging and sensing applications. Supplementary material for this article is available online

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