elliptic defect
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Nanophotonics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 3243-3249 ◽  
Author(s):  
Yao Huang ◽  
Youming Zhang ◽  
Jingjing Zhang ◽  
Dongjue Liu ◽  
Qijie Wang ◽  
...  

AbstractWe theoretically investigate the illusion device designed by a conformal transformation that can render an elliptic defect behave like a flat mirror. Different from illusion devices consisting of the complementary medium and anti-object with negative permittivity and permeability, our proposed illusion device requires only isotropic positive permittivity medium. It offers a possible route to eliminate the lateral shift in the conventional quasi-conformal carpet cloak. Interestingly, with the same conformal transformation, we can achieve an impedance-matched flat absorber by simply varying the shape and the refractive index of the defects. Both the illumination device and the absorber in our design have broad bandwidth, wide-illumination range and polarization-insensitive performance.


2007 ◽  
Vol 142 (4) ◽  
pp. 223-227 ◽  
Author(s):  
Yanfang Feng ◽  
Fugen Wu ◽  
Huilin Zhong ◽  
Tinwan Wu

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