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A type of tunable plasmonic lens with nanoslits is proposed for subwavelengthimaging in the far field at different wavelengths. The nanoslits array in theplasmonic lens, which have constant depths but varying widths, could generatedesired optical phase retardations based on the particular propagation propertyof the Surface Plasmon Polaritons (SPPs) in the metal-dielectric-metal (MDM)slit waveguides. We theoretically and numerically demonstrate the tunability ofa single plasmonic lens for subwavelength imaging (full width at half maximum,0.37 ~0.47) by adjusting the surrounding dielectric fluid, thereby realizingthe compact in-plane tunable plasmonic lens. This work provides a novelapproach for developing integrative tunable plasmonic lens for a variety oflab-on-chip applications.

Actively tunable plasmonic lens for subwavelength imaging at different wavelengths