Title :
Experimental verification of a zero-index near-infrared metamaterial
Author :
Jiang, Zhi Hao ; Yun, Seokho ; Xu, Qian ; Werner, Douglas H. ; Liu, Zhiwen ; Mayer, Theresa S.
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
In this paper, we present a free-standing optical zero-index metamaterial (ZIM) with a symmetric structure in the direction of wave propagation. The metamaterial consists of a gold-polyimide-gold tri-layer stack perforated by air holes to form a fishnet geometry. With the aid of a genetic algorithm (GA), this structure is optimized to exhibit a near-zero refractive index with low absorption loss and a good impedance match to free space. The ZIM was fabricated and characterized. The measured results are found to be in strong agreement with the simulation predictions.
Keywords :
genetic algorithms; gold; metamaterials; optical multilayers; optical polymers; air holes; fishnet geometry; free-standing optical zero-index metamaterial; genetic algorithm; gold-polyimide-gold tri-layer stack; impedance match; low absorption loss; near-zero refractive index; symmetric structure; wave propagation; zero-index near-infrared metamaterial; Genetic algorithms; Gold; Holography; Indexes; Metamaterials; Reflection; Scattering parameters; freestanding; metamaterial; zero-index;
Conference_Titel :
Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on
Conference_Location :
Spokane, WA
Print_ISBN :
978-1-4244-9562-7
DOI :
10.1109/APS.2011.5996495
