Synthesizing low loss negative index metamaterial stacks for the mid-infrared using genetic algorithms | Zendy

Jeremy A. Bossard | Zendy; Seokho Yun | Zendy; Douglas H. Werner | Zendy; Theresa S. Mayer | Zendy

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Synthesizing low loss negative index metamaterial stacks for the mid-infrared using genetic algorithms

Author(s) -

Jeremy A. Bossard,

Seokho Yun,

Douglas H. Werner,

Theresa S. Mayer

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.014771

Subject(s) - metamaterial , stack (abstract data type) , figure of merit , metamaterial absorber , materials science , optics , refractive index , electrical impedance , impedance matching , optoelectronics , metamaterial antenna , infrared , absorption (acoustics) , computer science , tunable metamaterials , physics , telecommunications , quantum mechanics , directional antenna , antenna (radio) , slot antenna , programming language

Negative index metamaterial designs for the mid-infrared with low absorption and impedance mismatch losses are presented. A robust genetic algorithm is employed to optimize the flexible metamaterial structure for targeted refractive index and impedance values. A new figure of merit is introduced to evaluate the impedance match of the metamaterial to free space. Two designs are presented demonstrating low-loss characteristics for a thin metamaterial with two metal screens and a thick metamaterial stack with five screens. The device performance is analyzed when adding more screens to the structure, revealing that optimizing a thick stack produces a metamaterial with properties approaching those of a bulk material.

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