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Open AccessArticle

Cheaper, Wide-Band, Ultra-Thin, and Multi-Purpose Single-Layer Metasurface Polarization Converter Design for C-, X-, and Ku-Band Applications

by Yunus Kaya

Symmetry 2023, 15(2), 442; https://doi.org/10.3390/sym15020442 - 7 Feb 2023

Cited by 13 | Viewed by 3580

Abstract

This article presents the design of wide-band, ultra-thin, and multi-purpose polarization converter utilizing metasurface for C-, X-, and Ku-band applications. Having a topology on a FR-4 substrate with metasurface metallic patterns on the front and an all-metallic surface finish on the back, the [...] Read more.

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plane with unique features of having both linear polarization (LP) and circular polarization (CP) property. While the polarization conversion ratio (PCR) of converter in normal incidence case is more than 90% in three different frequency bands of 6.46–6.78 GHz, 10.52–11.85 GHz, and 16.49–17.37 GHz, it shows linear-to-linear polarization feature and a linear-to-circular polarization feature with left-handed circular polarization (LHCP) for the frequency range between 7.28 and 9.40 GHz and right-handed circular polarization (RHCP) for the frequency range between 13.38 and 15.19 GHz. It is also seen that the converter has a PCR value of around 90% for oblique incidence case with incidence angles up to 45

^{°}

. Extensive simulations have been conducted to prove the performance of suggested converter with the aid of a commercially-available simulation platform, called CST Microwave Studio. The advantages of suggested polarization converter are low-cost, wide-band, ultra-thin, and having both LP and CP conversion in C-, X-, and Ku-bands. Full article

(This article belongs to the Special Issue Metamaterials and Symmetry: Recent Advances and Applications)

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24 pages, 7534 KB

Open AccessReview

Recent Development in Metasurfaces: A Focus on Sensing Applications

by Nikolay L. Kazanskiy, Svetlana N. Khonina and Muhammad A. Butt

Nanomaterials 2023, 13(1), 118; https://doi.org/10.3390/nano13010118 - 26 Dec 2022

Cited by 72 | Viewed by 10039

Abstract

One of the fastest-expanding study areas in optics over the past decade has been metasurfaces (MSs). These subwavelength meta-atom-based ultrathin arrays have been developed for a broad range of functions, including lenses, polarization control, holography, coloring, spectroscopy, sensors, and many more. They allow exact control of the many properties of electromagnetic waves. The performance of MSs has dramatically improved because of recent developments in nanofabrication methods, and this concept has developed to the point that it may be used in commercial applications. In this review, a vital topic of sensing has been considered and an up-to-date study has been carried out. Three different kinds of MS absorber sensor formations, all-dielectric, all-metallic, and hybrid configurations, are presented for biochemical sensing applications. We believe that this review paper will provide current knowledge on state-of-the-art sensing devices based on MSs. Full article

(This article belongs to the Special Issue Research of Photonics at the Nanometer Scale)

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10 pages, 2784 KB

Open AccessEditor’s ChoiceArticle

Reflective Quasi-Continuous Metasurface with Continuous Phase Control for Light Focusing

by Long Chen, Zhenglong Shao, Jia Liu and Dongliang Tang

Materials 2021, 14(9), 2147; https://doi.org/10.3390/ma14092147 - 23 Apr 2021

Cited by 9 | Viewed by 3138

Abstract

Benefitting from the arbitrary and flexible light modulation, metasurface has attracted extensive attention and been demonstrated in different applications. However, most reported metasurface-based devices were normally composed of discrete micro or nano structures, therefore the discretization precision limited the performance of the device, including the focusing efficiency, stray light suppression, and broadband performance. In this work, an all-metallic reflective metasurface consisting of numerous quasi-continuous nanostructures is proposed to realize high-efficiency and broadband focusing. The constructed quasi-continuous metasurface (QCMS) is then verified numerically through electromagnetic simulation, and the numerical results show a higher focusing efficiency and a better stray light suppression effect, compared to a binary-phase-based metalens. Through the same design strategy, a QCMS with the ability to overcome the diffraction limit can also be constructed, and a focal spot with the size of 0.8 times the diffraction limit can be achieved. We expect that this quasi-continuous structure could be utilized to construct other high-performance devices that require continuous phase controls, such as the beam deflector, orbital angle momentum generator, and self-accelerating beam generator. Full article

(This article belongs to the Special Issue Quasi-Continuous Metasurfaces for High-Performance Functional Electromagnetic Wave Devices)

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