title: Far-field subwavelength imaging with near-field resonant metalens scanning at microwave frequencies.
abstract: A method for far-field subwavelength imaging at microwave frequencies using near-field resonant metalens scanning is proposed. The resonant metalens is composed of switchable split-ring resonators (SRRs). The on-SRR has a strong magnetic coupling ability and can convert evanescent waves into propagating waves using the localized resonant modes. In contrast, the off-SRR cannot achieve an effective conversion. By changing the switch status of each cell, we can obtain position information regarding the subwavelength source targets from the far field. Because the spatial response and Green's function do not need to be measured and evaluated and only a narrow frequency band is required for the entire imaging process, this method is convenient and adaptable to various environment. This method can be used for many applications, such as subwavelength imaging, detection, and electromagnetic monitoring, in both free space and complex environments.
authors.affiliation: Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
authors.forename: Ren
authors.initials: R
authors.lastname: Wang
authors.affiliation: Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
authors.forename: Bing-Zhong
authors.initials: BZ
authors.lastname: Wang
authors.affiliation: Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
authors.forename: Zhi-Shuang
authors.initials: ZS
authors.lastname: Gong
authors.affiliation: Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Ding