Subwavelength-resolved Bidirectional Imaging Between Two And Three Dimensions Using A Surface Plasmon Launching Lens

摘要

We demonstrate subwavelength-resolved bidirectional conjugate imaging between three-dimensional far-field and two-dimensional surface plasmon (SP) by using a SP launching lens (SPLL), which consists of multiple groove zones that is designed according to the Fresnel zone on a gold film. Resolvable separations between two SP point sources of 704 and 668 nm were obtained for far-field to SP and the contrary, respectively, at λ = 830 nm. The SPLL shows similar imaging properties to a traditional optical lens, which can be used to connect multiple channels between far-field and SP.