Analytical study of subwavelength imaging by uniaxial epsilon-near-zero metamaterial slabs

被引:27
作者
Castaldi, Giuseppe [1 ]
Savoia, Silvio [1 ]
Galdi, Vincenzo [1 ]
Alu, Andrea [2 ]
Engheta, Nader [3 ]
机构
[1] Univ Sannio, Waves Grp, Dept Engn, I-82100 Benevento, Italy
[2] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
[3] Univ Penn, Dept Elect & Syst Engn, Philadelphia, PA 19104 USA
关键词
SILVER SUPERLENS; INTEGRALS; MEDIA; WAVE;
D O I
10.1103/PhysRevB.86.115123
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We discuss the imaging properties of uniaxial epsilon-near-zero metamaterial slabs with possibly tilted optical axis, analyzing their subwavelength focusing properties as a function of the design parameters. We derive in closed analytical form the associated two-dimensional Green's function in terms of special cylindrical functions. For the near-field parameter ranges of interest, we are also able to derive a small-argument approximation in terms of simpler analytical functions. Our results, validated and calibrated against a full-wave reference solution, expand the analytical tools available for computationally efficient and physically incisive modeling and design of metamaterial-based subwavelength imaging systems.
引用
收藏
页数:10
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