Abstract
We report a planar metamaterial consisting of double-layer Archimedean spirals for circular dichroism (CD) study in the infrared band. A maximum CD value of about 0.5 is designed by optimizing the zoom coefficient, thickness and size combination of the upper and bottom spirals. Different from almost all previous works, the mechanism of CD of our proposed double-layer Archimedean planar metamaterial is due to the anisotropic absorption of the in-plane gap plasmon excited in the metal-dielectric-metal structure. Our model shows good CD performance and may find useful applications in biomedicine, optoelectronics, and optical communication based on the in-plane gap plasmon.
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