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High-Q Metallic Fano Metamaterial for Highly Efficient Cerenkov Lasing

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Title
High-Q Metallic Fano Metamaterial for Highly Efficient Cerenkov Lasing
Author
Kim, SeontaeBaek, In-KeunBhattacharya, RanajoyHong, DongpyoSattorov, MatlabjonBera, AnirbanSo, Jin-KyuKim, Dai-SikPark, Gun-Sik
Issue Date
2018-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED OPTICAL MATERIALS, v.6, no.12, pp.1800041
Abstract
A high-quality-factor (high-Q) metallic Fano metamaterial is demonstrated both experimentally and theoretically. This material is suitable for highly efficient Cerenkov lasing in which subwavelength metallic slits are arranged to form asymmetric unit cells. In contrast to conventional dielectric Cerenkov or Smith-Purcell devices, in the proposed device, convection electrons traverse the high-Q metallic metamaterial. The interplay between an extremely low group velocity from the infinite transverse permittivity of the anisotropic metamaterial and the subradiant damping from a Fano-type slit mode is shown to be responsible for the high-Q value, which is measured to be unprecedented at 700. The resulting improvement in the Cerenkov lasing efficiency is estimated to be more than two orders of magnitude using a particle-in-cell simulation.
URI
https://scholarworks.unist.ac.kr/handle/201301/26348
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adom.201800041
DOI
10.1002/adom.201800041
ISSN
2195-1071
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PHY_Journal Papers
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