Experimental studies of far-field superlens for sub-diffractional optical imaging.
Contrary to the conventional near-field superlensing, subwavelength superlens imaging is experimentally demonstrated in the far-field. The key element is termed as a Far-field SuperLens (FSL) which consists of a conventional superlens and a nanoscale coupler. The evanescent fields from the object are enhanced and then converted into propagating fields by the FSL. By only measuring the propagating field in the far-field, the object image can be reconstructed with subwavelength resolution. As an example of this concept, we design and fabricate a silver structured one dimensional FSL. Experimental results show that feature resolution of better than 50nm is possible using current FSL design.
Liu
Zhaowei
Z
Durant
Stéphane
S
Lee
Hyesog
H
Pikus
Yuri
Y
Xiong
Yi
Y
Sun
Cheng
C
Zhang
Xiang
X