On the specially designed fractal metasurface-based dual-polarization converter in the THz regime

Bilal, Rana Muhammad Hasan; Baqir, M. A.; Choudhury, Pankaj Kumar; Ali, Muhammad Mahmood; Rahim, Arbab Abdur

doi:10.1016/j.rinp.2020.103358

Cited by 56 publications

(16 citation statements)

References 51 publications

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“…This means that there is a strong polarization conversion. After the simulation, it is evident from Figures 3a and 7a that the operating frequency band of the proposed polarization converter is shifted from (13-26.2 GHz) to (9)(10)(11)(12)(13)(14)(15)(16)(17)(18). It can also be tuned to higher frequencies by lowering the size of the participating unit cell.…”

Section: Parametric Variationmentioning

confidence: 98%

“…Metasurfaces, the 2D counterpart of metamaterials [8][9][10][11], can control EM waves in a low−profile manner by specially designed sub−wavelength meta−structures with proper optimization. They are widely used in constructing various meta−devices, including absorbers, holograms, lenses, and sensors [12][13][14][15][16][17]. They can alter the amplitude, phase, and polarization of EM waves due to controlling the geometric parameters of the underlying unit cell, and have found potential applications in various fields, including antenna gain enhancement [18,19], radar cross−area reduction [20], and MIMO antenna isolation [21].…”

Section: Introductionmentioning

confidence: 99%

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Ultrawideband Cross-Polarization Converter Using Anisotropic Reflective Metasurface

et al. 2022

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Broadband metasurface-based devices are essential and indispensable in modern wireless communication systems. This paper presents an ultra−wideband and wide incident angle reflective cross−polarization converter metasurface. The unit cell of the proposed structure is a 45° rotated anisotropic meta−sheet developed by cutting the rhombus−shaped patch from the central part of the square patch. The unit cell’s top structure and ground blocking sheet are made of copper, whereas a dielectric substrate (FR−4) is used as an intermediate spacer between them. The unit cell thickness is minimal compared to the operating wavelength (1/14λ∘, where λ∘ is the wavelength of the starting frequency of 13 GHz of the operating band). The proposed structure efficiently converts linearly polarized waves into their orthogonal component, with a polarization conversion ratio of (PCR > 90%) over a broad frequency spectrum of 13 GHz to 26 GHz. The physical origin of polarization conversion is also depicted using surface current distribution plots. An ultra−wideband and highly efficient polarization conversion (above 90%) is achieved with the help of strong electromagnetic resonance coupling between the upper and lower layer of the metasurface. This kind of ultra−wideband polarization conversion metasurface can be employed in satellite communication, radar cross−section reduction, and navigation systems.

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Section: Parametric Variationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Ultrawideband Cross-Polarization Converter Using Anisotropic Reflective Metasurface

et al. 2022

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“…At 0.73–1.41 THz, the PCR is above 95% . Bilal et al achieved perfect polarization conversion at 1.10 THz and 2.13 THz …”

Section: Introductionmentioning

confidence: 99%

“…11 Bilal et al achieved perfect polarization conversion at 1.10 THz and 2.13 THz. 12 This article is licensed under CC-BY-NC-ND 4 From the above research results, the performance of terahertz polarization converters in terms of polarization conversion bandwidth, PCR, and RBW needs to be further improved. To solve these problems, a polarization conversion device based on the Fabry-Peŕot (F-P) cavity model is designed, 8,13−15 in which each layer is equivalent to a mirror, and the interference of polarization couplings in a multireflection process may either enhance or reduce the overall emergent fields with co-and cross-polarization.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast All-Optical Switching Modulation of Terahertz Polarization Conversion Metasurfaces Based on Silicon

Zhou,

Qiu,

et al. 2023

ACS Omega

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With the development of ultrafast optics, all-optical control of terahertz wave modulation based on semiconductors has become an important technology of terahertz wave regulation. In this article, an ultrawideband terahertz linear polarization converter consisting of a double-layered metasurface is first proposed. The polarization conversion ratio of the device is ∼ 100% at 0.2–2.2 THz, and the transmission of copolarization approaches zero in the full band, which demonstrates the ability of high-purity output with rotating input linear polarization of 90° over an ultrawideband. By analysis of the surface current and electric field distribution, the physical mechanism of polarization conversion is elucidated. In addition, the influence of important geometric parameters on the device is discussed and analyzed in detail, which provides theoretical support for the design of high-performance polarization converters. More importantly, by introducing semiconductor silicon to construct an actively controllable metasurface, we design all-optical polarization converters based on a meta-atomic molecularization metasurface and all-dielectric metasurface; the dynamically tunable ultrawideband linear polarization conversion is realized under optical pumping, which solves the inherent problem of the performance of the metasurface polarization converters. Numerical simulation shows that the switching response of the two types of actively controllable devices under optical pumping is about 700 and 1800 ps, respectively, and can manipulate polarized wave conversion ultrafast, which brings new opportunities for all-optical controlled ultrafast terahertz polarization converters. Our results provide a feasible scheme for the development of state-of-the-art active and controllable ultrafast terahertz metasurface polarization converters, which have great application potential in short-range wireless terahertz communication, ultrafast optical switches, the transient spectrum, and optical polarization control devices.

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“…W ITH the advancement of communication systems and the growing demand for ultra high speed communications, the electronics and photonics communities are witnessing the emergence of waveguides, filters, sensors, amplifiers, polarization converters, etc in the THz regime (around 0.1 -10 THz) for a variety of applications including imaging [1], [2], [3], sensing [4], [5], [6], and communications [7], [8], [9]. However, there is a limited research in the development of wideband polarization converters together with dynamically controlling the polarization state of THz waves.…”

Section: Introductionmentioning

confidence: 99%

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

Nagini

2022

IEEE Photonics J.

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An ultrathin and wideband reflective crosspolarization converter is presented in this paper. The design consists of a pair of modified dumbbell shaped resonators which are connected together with a conductive strip. The proposed single-layer THz metasurface achieved a high polarization conversion ratio (PCR) of ≥95% in the operating frequency ranging from 1.76-4.26 THz. This wide-bandwidth cross-polarization conversion is obtained by exciting multiple closely spaced resonant frequencies at 1.98 THz, 2.61 THz, 2.95 THz, and 3.93 THz. The working mechanism of the proposed structure is analyzed and the polarizer exhibits an excellent angular stability upto 40 0 of incidence. Further, the proposed cross-polarizer exhibits continuous tunability of PCR over the operating frequencies when photoconductive silicon (Si) is filled in the gap between pair of dumbbell-resonators. The wideband characteristics and the switchable property show that the proposed reflective cross polarizer is an excellent candidate for manipulation and control of polarization in THz communication systems.

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On the specially designed fractal metasurface-based dual-polarization converter in the THz regime

Cited by 56 publications

References 51 publications

Ultrawideband Cross-Polarization Converter Using Anisotropic Reflective Metasurface

Ultrawideband Cross-Polarization Converter Using Anisotropic Reflective Metasurface

Ultrafast All-Optical Switching Modulation of Terahertz Polarization Conversion Metasurfaces Based on Silicon

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

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