Spiral Chiral Metamaterial Structure Shape for Optical Activity Improvements
Kohei Maruyama,
Miyako Mizuna,
Takuya Kosuge,
Yuki Takeda,
Eiji Iwase,
Tetsuo Kan
Affiliations
Kohei Maruyama
School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
Miyako Mizuna
Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 169-8555, Japan
Takuya Kosuge
Department of Mechanical and Intelligent Systems Engineering, Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
Yuki Takeda
Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 169-8555, Japan
Eiji Iwase
Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 169-8555, Japan
Tetsuo Kan
Department of Mechanical and Intelligent Systems Engineering, Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
We report on a spiral structure suitable for obtaining a large optical response. We constructed a structural mechanics model of the shape of the planar spiral structure when deformed and verified the effectiveness of the model. As a verification structure, we fabricated a large-scale spiral structure that operates in the GHz band by laser processing. Based on the GHz radio wave experiments, a more uniform deformation structure exhibited a higher cross-polarization component. This result suggests that uniform deformation structures can improve circular dichroism. Since large-scale devices enable speedy prototype verification, the obtained knowledge can be exported to miniaturized-scale devices, such as MEMS terahertz metamaterials.
