The paper presents the experimental demonstration of a dual-polarity plasmonic metalens for visible light. Traditional lenses have either positive (convex) or negative (concave) polarity, depending on the curvatures of their interfaces. The authors introduce a counter-intuitive flat lens that can switch between these two polarities by controlling the helicity of the input light. Specifically, by adjusting the orientation angle of plasmonic dipole antennas, the lens can achieve a phase shift ranging from 0 to 2π, allowing it to function as both a positive and negative lens for circularly polarized (CP) light. The lens exhibits both real and virtual focal planes, as well as magnified and demagnified imaging, at visible and near-infrared wavelengths. This dual-polarity plasmonic metalens opens new avenues for advanced research and applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing, and integrated nano-optoelectronics. The design and fabrication of the lens are detailed, along with experimental results confirming its dual-polarity functionality.The paper presents the experimental demonstration of a dual-polarity plasmonic metalens for visible light. Traditional lenses have either positive (convex) or negative (concave) polarity, depending on the curvatures of their interfaces. The authors introduce a counter-intuitive flat lens that can switch between these two polarities by controlling the helicity of the input light. Specifically, by adjusting the orientation angle of plasmonic dipole antennas, the lens can achieve a phase shift ranging from 0 to 2π, allowing it to function as both a positive and negative lens for circularly polarized (CP) light. The lens exhibits both real and virtual focal planes, as well as magnified and demagnified imaging, at visible and near-infrared wavelengths. This dual-polarity plasmonic metalens opens new avenues for advanced research and applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing, and integrated nano-optoelectronics. The design and fabrication of the lens are detailed, along with experimental results confirming its dual-polarity functionality.