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Advances in Metasurface Optics and Devices

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: closed (20 May 2025) | Viewed by 3698

Special Issue Editor


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Guest Editor
School of Microelectronics, Shanghai University, Shanghai 201800, China
Interests: metalens; metasurface; flat optics; silicon photonics

Special Issue Information

Dear Colleagues,

The metasurface has emerged as a promising technology with which to overcome the challenges of conventional bulk optics by offering a new method of light manipulation based on scattering from resonant nanostructures. The subwavelength-scale control of optical amplitude, phase, and polarization in a compact form allows metasurface-based optical components to be utilized in imaging, wavefront engineering, information processing, etc. The technology used to design and fabricate these devices necessitates knowledge and understanding of the relationship between their structures and optical characteristics.

This Special Issue will be devoted to advances in metasurface optics and devices. Original papers and review articles related to the above-mentioned areas are cordially invited.

Prof. Dr. Ting Hu
Guest Editor

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Keywords

  • metasurface
  • subwavelength
  • wavefront engineering
  • flat optics

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Published Papers (2 papers)

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Research

15 pages, 5932 KiB  
Article
High-Gain Dual-Polarization Microstrip Antenna Based on Transmission Focusing Metasurface
by Yibo Sun, Bin Cai, Lingling Yang, Ling Wu, Yongzhi Cheng, Hui Luo, Fu Chen and Xiangcheng Li
Materials 2024, 17(15), 3730; https://doi.org/10.3390/ma17153730 - 27 Jul 2024
Cited by 17 | Viewed by 1636
Abstract
In this paper, a single-feed microstrip antenna (MA) equipped with a transmission-mode focusing metasurface (MS) is proposed to achieve dual-polarization capabilities and superior high-gain radiation performance. The original-feed MA comprises two distinct layers of coaxial-fed tangential patches, enabling it to emit a circular [...] Read more.
In this paper, a single-feed microstrip antenna (MA) equipped with a transmission-mode focusing metasurface (MS) is proposed to achieve dual-polarization capabilities and superior high-gain radiation performance. The original-feed MA comprises two distinct layers of coaxial-fed tangential patches, enabling it to emit a circular polarization (CP) wave with a gain of 3.5 dBic at 5.6 GHz and linear polarization (LP) radiation with a gain of 4 dBi at 13.7 GHz. To improve the performance of the single-feed MA, a dual-polarization transmission focusing MS is proposed and numerically substantiated. By positioning the originally designed MA at the focal point of the MS, we create a transmission-mode MS antenna system capable of achieving CP and LP radiations with the significantly higher gains of 12.9 dBic and 14.8 dBi at 5.6 GHz and 13.7 GHz, respectively. Measurements conducted on the fabricated dual-polarization focusing MS antenna closely align with the simulation results, validating the effectiveness of our approach. This work underscores the significant potential of dual-polarization high-speed data systems and offers a practical solution for enhancing antenna gains in contemporary wireless communication systems. Full article
(This article belongs to the Special Issue Advances in Metasurface Optics and Devices)
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11 pages, 3448 KiB  
Article
Nanoimprinted TiO2 Metasurfaces with Reduced Meta-Atom Aspect Ratio and Enhanced Performance for Holographic Imaging
by Kaiyu Zhang, Yuqi Lin, Yang Qiu, Xingyan Zhao, Shaonan Zheng, Yuan Dong, Qize Zhong and Ting Hu
Materials 2024, 17(10), 2273; https://doi.org/10.3390/ma17102273 - 11 May 2024
Cited by 1 | Viewed by 1667
Abstract
Metasurface holograms, with the capability to manipulate spatial light amplitudes and phases, are considered next-generation solutions for holographic imaging. However, conventional fabrication approaches for meta-atoms are heavily dependent on electron-beam lithography (EBL), a technique known for its expensive and time-consuming nature. In this [...] Read more.
Metasurface holograms, with the capability to manipulate spatial light amplitudes and phases, are considered next-generation solutions for holographic imaging. However, conventional fabrication approaches for meta-atoms are heavily dependent on electron-beam lithography (EBL), a technique known for its expensive and time-consuming nature. In this paper, a polarization-insensitive metasurface hologram is proposed using a cost-effective and rapid nanoimprinting method with titanium dioxide (TiO2) nanoparticle loaded polymer (NLP). Based on a simulation, it has been found that, despite a reduction in the aspect ratio of meta-atoms of nearly 20%, which is beneficial to silicon master etching, NLP filling, and the mold release processes, imaging efficiency can go up to 54% at wavelength of 532 nm. In addition, it demonstrates acceptable imaging quality at wavelengths of 473 and 671 nm. Moreover, the influence of fabrication errors and nanoimprinting material degradation in terms of residual layer thickness, meta-atom loss or fracture, thermal-induced dimensional variation, non-uniform distribution of TiO2 particles, etc., on the performance is investigated. The simulation results indicate that the proposed device exhibits a high tolerance to these defects, proving its applicability and robustness in practice. Full article
(This article belongs to the Special Issue Advances in Metasurface Optics and Devices)
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