A Simple High-resolution Imaging System Made of Metamaterials
High resolution imaging or super resolution imaging is always a hot topic in the field of artificial metamaterials. Since the conventional optical imaging lenses suffer from the so-called diffraction limit, the resolution is limited to half a wavelength. In order to break this restriction, many metamaterial-based superlenses and hyperlenses have been proposed and investigated. In this work, we present a simple high-resolution imaging system, which is composed of a magnifying lens and a planar focusing lens. The all-dielectric metamaterial magnifying lens is a modified hemispherical solid immersion lens (SIL) with impedance-matching layer, which is made of gradient-index materials. The high permittivity materials in the core of the magnifying lens can magnify evanescent waves that carry subwavelength imaging information. The magnified waves will propagate smoothly to the free space by the matching layer outside the core region. The planar focusing lens will gather the imaging information and produce the image. Therefore, the image formed by the focusing lens contains the magnified subwavelength-imaging information. The planar focusing lens is designed by geometry optics and cylindrically symmetrical. In the simulation, two point sources with a distance of less than half a wavelength are embedded in the core of the magnifying lens. Thus, the two point sources are imaged at the focus of the planar focusing lens with enlarged distance. Both of the magnifying lens and planar focusing lens are made of isotropic dielectric metamaterials, hence, such a simple high-resolution imaging system works efficiently in a broad band.
Shuo Ge Wei Xiang Jiang
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1156-1159
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）