Abstract
Fresnel-zone plate lenses provide focusing performance while having low profile. Unfortunately, they usually display higher reflection losses than conventional dielectric lenses. Here, we demonstrate a low-profile Wood zone plate metalens based on the fishnet metamaterial working in a near-zero regime with an equivalent refractive index less than unity (nf = 0.51). The metalens is made of alternating dielectric and fishnet metamaterial concentric rings. The use of fishnet metamaterial allows reducing the reflections from the lens, while maintaining
low profile, low cost and ease of manufacturing. The lens is designed to work at the W-band of the millimeter-waves
range with a focal length FL = 22.8 mm (7.5 k0) aiming at antenna or radar system applications. The focusing performance
of the lens along with its radiation characteristics in a lens antenna configuration have been studied
numerically and confirmed experimentally, showing a gain improvement of ~2.5 dB with respect to a fishnet Soret
metalens.
Original language | English |
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Article number | 8 |
Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | EPJ Applied Metamaterials |
Volume | 2 |
Early online date | 23 Dec 2015 |
DOIs | |
Publication status | E-pub ahead of print - 23 Dec 2015 |
Keywords
- fishnet metamaterial
- Fresnel zone plates
- Lens
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering