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Yang Z, Wang Z, Tao H, et al. Manipulation of wavefront using helical metamaterials. Opt Express. 2016;24(16):18266-76doi: 10.1364/OE.24.018266.
Yang, Z., Wang, Z., Tao, H., & Zhao, M. (2016). Manipulation of wavefront using helical metamaterials. Optics express, 24(16), 18266-76. https://doi.org/10.1364/OE.24.018266
Yang, Zhenyu, et al. "Manipulation of wavefront using helical metamaterials." Optics express vol. 24,16 (2016): 18266-76. doi: https://doi.org/10.1364/OE.24.018266
Yang Z, Wang Z, Tao H, Zhao M. Manipulation of wavefront using helical metamaterials. Opt Express. 2016 Aug 08;24(16):18266-76. doi: 10.1364/OE.24.018266. PMID: 27505790.
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Opt Express. 2016 Aug 08;24(16):18266-76. doi: 10.1364/OE.24.018266.

Manipulation of wavefront using helical metamaterials.

Optics express

Zhenyu Yang, Zhaokun Wang, Huan Tao, Ming Zhao

PMID: 27505790 DOI: 10.1364/OE.24.018266

Abstract

Helical metamaterials, a kind of 3-dimensional structure, has relatively strong coupling effect among the helical nano-wires. Therefore, it is expected to be a good candidate for generating phase shift and controlling wavefront with high efficiency. In this paper, using the finite-difference time-domain (FDTD) method, we studied the phase shift properties in the helical metamaterials. It is found that the phase shift occurs for both transmitted and reflected light waves. And the maximum of reflection coefficients can reach over 60%. In addition, the phase shift (φ) is dispersionless in the range of 600 nm to 860 nm, that is, it is only dominated by the initial angle (θ) of the helix. The relationship between them is φ = ± 2θ. Using Jones calculus we give a further explanation for these properties. Finally, by arranging the helixes in an array with a constant phase gradient, the phenomenon of anomalous refraction was also observed in a broad wavelength range.

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