Open AccessBroadband super-resolution imaging by a superlens with unmatched dielectric medium
Author(s) -
Xuefeng Yang,
Yao Liu,
Jiang Ma,
Jianhua Cui,
Hui Xing,
Wei Wang,
Changtao Wang,
Xiangang Luo
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019686
Subject(s) - superlens , optics , dielectric , broadband , materials science , permittivity , phase modulation , optoelectronics , refractive index , physics , phase noise
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.