title: Broadband super-resolution imaging by a superlens with unmatched dielectric medium.
abstract: It is shown that a superlens with unmatched dielectric medium (termed as "unmatched superlens", UMSL) can enable super-resolution imaging in a broad frequency range. The broadband UMSL comprises dielectric-metal-dielectric layers with appropriately designed thickness. Numerical simulations demonstrate that the deficiency of imaging due to the mismatched permittivity of the metal and dielectric can be improved with the existence of two waveguide modes of the UMSL structure. The frequency band and quality of super resolution imaging are mainly determined by the two modes, which deliver the amplitude and phase modulation of transmitted evanescent waves in a wide transversal wavenumber range.
authors.affiliation: State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, P. O. Box 350, Chengdu 610209, China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Yang
authors.forename: Yao
authors.initials: Y
authors.lastname: Liu
authors.forename: Junxian
authors.initials: J
authors.lastname: Ma
authors.forename: Jianhua
authors.initials: J
authors.lastname: Cui
authors.forename: Hui
authors.initials: H
authors.lastname: Xing
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Changtao
authors.initials: C
authors.lastname: Wang
authors.forename: Xiangang
authors.initials: X
authors.lastname: Luo