Terahertz metalenses for evanescent wave focusing and super-resolution imaging

被引：6
|
作者：
Tang, Heng-He [1 ]
Liu, Pu-Kun [1 ]
机构：
[1] Peking Univ, Sch Elect Engn & Comp Sci, Beijing 100871, Peoples R China
来源：
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS | 2015年 / 29卷 / 13期
基金：
中国国家自然科学基金;
关键词：
terahertz; super-resolution imaging; spatial Fourier transform; metamaterial; metalens; REFRACTIVE-INDEX; METAMATERIAL; LENSES;
D O I：
10.1080/09205071.2015.1061957
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Super-resolution focusing in the metamaterials for both the propagating and evanescent wave emerging from free space is demonstrated based on the gradient-index (GRIN) metalenses. The theoretical investigation reveals that the evanescent wave in free space can be transformed into propagating wave in the metamaterial due to the specific dispersion of the metamaterial. So spatial Fourier transform (FT) with broad input angular spectrum are achieved when the metamaterials are designed with GRIN. Furthermore, the application of super-resolution imaging based on the spatial FT is also presented.
引用
收藏
页码：1776 / 1784
页数：9
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