A terahertz metamaterial with unnaturally high refractive index

Muhan Choi, Seung Hoon Lee, Yushin Kim, Seung Beom Kang, Jonghwa Shin, Min Hwan Kwak, Kwang-Young Kang, Yong-Hee Lee, Namkyoo Park and Bumki Min ()
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Muhan Choi: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea
Seung Hoon Lee: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea
Yushin Kim: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea
Seung Beom Kang: Convergence Components and Materials Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, South Korea
Jonghwa Shin: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea
Min Hwan Kwak: Convergence Components and Materials Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, South Korea
Kwang-Young Kang: Convergence Components and Materials Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, South Korea
Yong-Hee Lee: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea
Namkyoo Park: School of Electrical Engineering and Computer Science, Seoul National University
Bumki Min: Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-751, South Korea

Nature, 2011, vol. 470, issue 7334, 369-373

Abstract: Refractive index of 30-plus in new metamaterial Metamaterials, artificially designed composites with electromagnetic properties unobtainable in the natural world, are providing new opportunities for fundamental research as well as for useful applications. So far, the search for materials with a negative refractive index has been a priority, but to extend the scope for novel 'transformation optics' applications, materials with an unnaturally high refractive index would be similarly useful. Bumki Min and colleagues have now produced a broadband, flexible terahertz metamaterial with an unprecedentedly high refractive index of 38.6. Based on layered arrays of I-shaped thin gold building blocks, the new metamaterial provides a starting point for work on small-footprint cloaking devices, wide-angle lenses and slow-light devices.

Date: 2011
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DOI: 10.1038/nature09776

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