A dual-polarity plasmonic metalens for visible light is demonstrated, which can function as either a positive (convex) or negative (concave) lens depending on the helicity of the incident circularly polarized (CP) light. The lens is based on helicity-dependent phase discontinuities at the interface, allowing for the interchangeability of positive and negative polarities. This unique property enables the lens to produce both real and virtual focal planes, as well as magnified and demagnified imaging, on the same plasmonic lens at visible and near-infrared wavelengths. The lens is composed of an array of plasmonic dipoles with subwavelength separations, and the phase shift is controlled by adjusting the orientation angle of the dipoles. The polarity of the lens is determined by the helicity of the incident and detected CP light, allowing for a transformation between convex and concave lenses. The lens's planar geometry enables integration into other nanodevices using conventional micro- and nanofabrication techniques. The results show that the lens can focus light with both real and virtual focal points, and produce magnified and demagnified images. The dual-polarity plasmonic flat lens opens new avenues for applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing, and integrated nano-optoelectronics. The lens is fabricated using electron-beam lithography on an ITO-coated glass substrate, with gold dipoles of 200 nm length and 50 nm width. The lens is tested with a CP laser beam at 740 nm, and the results show that the lens can produce both real and virtual focal planes, as well as magnified and demagnified images. The lens is also used for imaging a chromium grating, showing magnified and reduced images for different circular polarizations. The results demonstrate the unique dual-polarity nature of the lens, which can be used for both convex and concave imaging. The lens is a promising candidate for future applications in integrated nanophotonic devices.A dual-polarity plasmonic metalens for visible light is demonstrated, which can function as either a positive (convex) or negative (concave) lens depending on the helicity of the incident circularly polarized (CP) light. The lens is based on helicity-dependent phase discontinuities at the interface, allowing for the interchangeability of positive and negative polarities. This unique property enables the lens to produce both real and virtual focal planes, as well as magnified and demagnified imaging, on the same plasmonic lens at visible and near-infrared wavelengths. The lens is composed of an array of plasmonic dipoles with subwavelength separations, and the phase shift is controlled by adjusting the orientation angle of the dipoles. The polarity of the lens is determined by the helicity of the incident and detected CP light, allowing for a transformation between convex and concave lenses. The lens's planar geometry enables integration into other nanodevices using conventional micro- and nanofabrication techniques. The results show that the lens can focus light with both real and virtual focal points, and produce magnified and demagnified images. The dual-polarity plasmonic flat lens opens new avenues for applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing, and integrated nano-optoelectronics. The lens is fabricated using electron-beam lithography on an ITO-coated glass substrate, with gold dipoles of 200 nm length and 50 nm width. The lens is tested with a CP laser beam at 740 nm, and the results show that the lens can produce both real and virtual focal planes, as well as magnified and demagnified images. The lens is also used for imaging a chromium grating, showing magnified and reduced images for different circular polarizations. The results demonstrate the unique dual-polarity nature of the lens, which can be used for both convex and concave imaging. The lens is a promising candidate for future applications in integrated nanophotonic devices.