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Spiral Chiral Metamaterial Structure Shape for Optical Activity Improvements
Kohei Maruyama1, Miyako Mizuna2, Takuya Kosuge3
1School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan.
Abstract:
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.
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