3次元金属マイクロコイルを装加した金属スリットアレーによるテラヘルツ波帯での負の屈折率設計

カテゴリ: 論文誌(論文単位)

グループ名: 【E】センサ・マイクロマシン部門

発行日: 2015/11/01

タイトル(英語): Design of a Negative Refractive Index in a Terahertz Frequency by a Metal Slit Array with Three-dimensional Metal Microcoils

著者名: 石原　功基（茨城大学 工学部 電気電子工学科），岸　湧大（茨城大学大学院 理工学研究科 電気電子工学専攻），鈴木　健仁（茨城大学 工学部 電気電子工学科／茨城大学大学院 理工学研究科 電気電子工学専攻）

著者名(英語): Koki Ishihara (Department of Electrical & Electronic Engineering, Ibaraki University), Yudai Kishi (Major in Electrical and Electronic Engineering, Ibaraki University), Takehito Suzuki (Department of Electrical & Electronic Engineering, Ibaraki University/Major in Electrical and Electronic Engineering, Ibaraki University)

キーワード: メタマテリアル，負の屈折率，テラヘルツ波帯，3次元金属マイクロコイル　　metamaterial，negative refractive index，terahertz frequency，three-dimensional metal microcoil

要約(英語): The current understanding is that the progress of terahertz technology demands highly-functional and high-performance optical devices. Materials are limited in naturally-occurring materials with positive refractive indices when conventional techniques design the devices. However, metamaterial techniques can shed light on a variety of potential applications because a refractive index including a negative one is arbitrarily controlled by various subwavelength structures. Here, inspired by novel fabrication techniques of micron-scale structures, we design a negative refractive index by a metal-slit array with three-dimensional metal microcoils in a terahertz frequency. The parallel-plate waveguide under a cutoff frequency can produce a negative permittivity, and the resonance of the sprit-ring resonators can also produce a negative permeability. An effective negative refractive index with neff = -6.9 + j1.1 is designed at 0.26 THz by an approximate analysis with periodic boundary walls, and performance with n = -3.2 at 0.30 THz is visually confirmed by a full model analysis. A time-consuming procedure in the iterative design of the full model can be drastically escaped by initial parameters which is obtained by the approximate model. The structure with the negative refractive index would be applied to many progressive devices, such as bandpass filters, superlenses, and antennas.

本誌: 電気学会論文誌E（センサ・マイクロマシン部門誌） Vol.135 No.11 （2015） 特集：メタマテリアル・プラズモニクス

本誌掲載ページ: 466-473 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejsmas/135/11/135_466/_article/-char/ja/