Journal
OPTICS EXPRESS
Volume 17, Issue 17, Pages 14771-14779Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.014771
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Funding
- Penn State MRSEC
- NSF [DMR-0820404]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820404] Funding Source: National Science Foundation
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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. (C) 2009 Optical Society of America
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