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Proceedings Paper

Anomalous deflection based on three-dimensional variable nanopillar metasurfaces
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Paper Abstract

A metal-dielectric-metal nanopillar metasurfaces with variable three-dimensional sizes is proposed and experimentally demonstrated to achieve anomalous deflection at different angles with different phase gradients. Theoretical studies have shown that subwavelength nanopillar with different lengths, widths and heights on a glass substrate can achieve high amplitude response and complete 2π phase delay in the reflection field. Anomalous deflection metasurfaces with three phase gradients of π/2, π/4 or π/8 in supercell units composed of 4, 8, or 16 nanopillars of different sizes working at wavelength of 1550 nm are designed and investigated. Under linearly polarized normal incident beam, the anomalous deflection angles of the three phase gradients are, respectively, 23.97°, 12.21° and 5.87° with a reflection of 83%, which is consistent with the generalized Snell's theory. The negative refraction and total reflection phenomenon under the oblique incident beams are generated in the case of phase gradient of π/4, which are completely consistent with the numerical results. Using two-photon laser direct writing technology, a metasurface with π/2 phase gradient nanopillar was fabricated on a 170 μm thick borosilicate glass substrate. The anomalous deflection angle measured by infrared polarization detection is 24°, which is essentially the same as the designed value. The demonstrated work provides a new way for realizing artificial control of electromagnetic wave propagation in optical communication and other fields.

Paper Details

Date Published: 18 June 2021
PDF: 11 pages
Proc. SPIE 11850, First Optics Frontier Conference, 118500K (18 June 2021); doi: 10.1117/12.2599414
Show Author Affiliations
Huirong Yang, Soochow Univ. (China)
Chinhua Wang, Soochow Univ. (China)


Published in SPIE Proceedings Vol. 11850:
First Optics Frontier Conference
Shining Zhu; Tiejun Cui; Xiangang Luo; Long Zhang, Editor(s)

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