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Analysis and design of concave lens with metallic slit array for terahertz wave band |
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| Authors: | Takehito Suzuki Hiroki Yonamine Takuya Konno John C Young Kotaro Murai Fumiaki Miyamaru Keisuke Takano Hideaki Kitahara Masanori Hangyo |
| Institution: | 1. Department of Electrical and Electronic Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan 2. Electrical and Computer Engineering, University of Kentucky, Lexington, KY, 40506-0046, USA 3. Department of Physics, Shinshu Universtiy, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan 4. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan |
| Abstract: | This paper presents a three-dimensional concave lens constructed from a metallic slit array. The effective refractive index is estimated to be $0<n<1$ . The actual lens requires spacers in the slits. A lens using a low loss dielectric material for the terahertz frequency band is designed. The fast wave effect is enhanced in order to mitigate the slow wave effect of the dielectric material. Full wave analysis results are obtained by ANSYS HFSS and the focusing effect of the three-dimensional concave lens is confirmed in the terahertz frequency band. |
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