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Huang Y, Kida T, Wakiuchi S, Okatani T, Inomata N, Kanamori Y. 3D Bulk Metamaterials with Engineered Optical Dispersion at Terahertz Frequencies Utilizing Amorphous Multilayered Split-Ring Resonators. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2405378. [PMID: 38976553 DOI: 10.1002/advs.202405378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 06/25/2024] [Indexed: 07/10/2024]
Abstract
A 3D bulk metamaterial (MM) containing amorphous multilayered split-ring resonators is proposed, fabricated, and evaluated. Experimentally, the effective refractive index is engineered via the 3D bulk MM, with a contrast of 0.118 across the frequency span from 0.315 to 0.366 THz and the index changing at a slope of 2.314 per THz within this frequency range. Additionally, the 3D bulk MM exhibits optical isotropy with respect to polarization. Moreover, the peak transmission and optical dispersion are tailored by adjusting the density of the split-ring resonators. Compared to reported conventional approaches for constructing bulk MMs, this approach offers advantages in terms of the potential for large-scale manufacturing, the ability to adopt any shape, optical isotropy, and rapid optical dispersion. These features hold promise for dispersive optical devices operating at THz frequencies, such as high-dispersive prisms for high-resolution spectroscopy.
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Affiliation(s)
- Ying Huang
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
| | - Takanori Kida
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
| | - Shun Wakiuchi
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
| | - Taiyu Okatani
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
| | - Naoki Inomata
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
| | - Yoshiaki Kanamori
- Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan
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Bui HN, Phi NH, Alsaadi A, Lee JW. Space-Time-Modulated Reconfigurable Metamaterial Based on a Field-Focused Cavity for Nonreciprocal Transmission Control and Frequency Conversion. ACS APPLIED MATERIALS & INTERFACES 2022; 14:26931-26940. [PMID: 35657371 DOI: 10.1021/acsami.2c04823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Lorentz reciprocity is a fundamental physical property limiting advanced wave propagation control. Previously, special materials and magnetic bias were used to break the reciprocity; however, the approaches are limited by the bulky and costly implementation. To achieve nonreciprocity without magnetic bias, space-time-modulated metamaterials have been investigated for far-field wave propagation control. The metamaterial can also support wave propagation based on near-field coupling between the periodically arranged unit cells, i.e., magneto-inductive waves (MIWs). Near-field wave propagation control via the metamaterial has various significant applications; nevertheless, the potential for near-field wave propagation control has not been fully explored. Therefore, it is necessary to investigate the potential of the space-time-modulated near-field metamaterial. This paper demonstrates nonreciprocal MIW propagation control using a space-time-modulated metamaterial. To achieve field manipulation, we propose a tunable unit cell suitable for creating a cavity mode at a deep subwavelength scale (∼λ/103). Spatial field modulation, achieved by breaking the translational symmetry of the unit cells, allows for the creation of reconfigurable waveguides on the metamaterial. Temporal field modulation, achieved by breaking the capacitive symmetry of the varactor, allows for direction-dependent transmission in the waveguide. This spatiotemporal modulation successfully achieves nonreciprocal wave propagation and frequency conversion, investigated under various conditions. The proposed space-time-modulated metamaterial may provide significant advances for a wide range of systems that require dynamic, nonreciprocal, near-field wave propagation control.
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Affiliation(s)
- Huu Nguyen Bui
- School of Electronics and Information, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 17104, Republic of Korea
| | - Ngoc Hung Phi
- School of Electronics and Information, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 17104, Republic of Korea
| | - Abdulrahman Alsaadi
- School of Electronics and Information, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 17104, Republic of Korea
| | - Jong-Wook Lee
- School of Electronics and Information, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 17104, Republic of Korea
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Zhang Z, Wang J, Fu X, Jia Y, Chen H, Feng M, Zhu R, Qu S. Single-layer metasurface for ultra-wideband polarization conversion: bandwidth extension via Fano resonance. Sci Rep 2021; 11:585. [PMID: 33436775 PMCID: PMC7804130 DOI: 10.1038/s41598-020-79945-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 12/09/2020] [Indexed: 11/18/2022] Open
Abstract
In this paper, we propose a method of designing ultra-wideband single-layer metasurfaces for cross-polarization conversion, via the introduction of Fano resonances. By adding sub-branches onto the unit cell structure, the induced surface currents are disturbed, leading to coexistence of both bright and dark modes at higher frequencies. Due to the strong interaction between the two modes, Fano resonance can be produced. In this way, five resonances in all are produced by the single-layer metasurface. The first four are conventional and are generated by electric and magnetic resonances, whereas the fifth one is caused by Fano resonance, which further extends the bandwidth. A prototype was designed, fabricated and measured to verify this method. Both the simulated and measured results show that a 1:4.4 bandwidth can be achieved for both x- and y-polarized waves, with almost all polarization conversion ratio (PCR) above 90%. This method provides an effective alternative to metasurface bandwidth extension and can also be extended to higher bands such as THz and infrared frequencies.
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Affiliation(s)
- Zhongtao Zhang
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Jiafu Wang
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China.
| | - Xinmin Fu
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Yuxiang Jia
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Hongya Chen
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Mingde Feng
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Ruichao Zhu
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China
| | - Shaobo Qu
- Department of Basic Science, Air Force Engineering University, Xi'an, 710051, Shanxi, People's Republic of China.
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Feng L, Huo P, Liang Y, Xu T. Photonic Metamaterial Absorbers: Morphology Engineering and Interdisciplinary Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1903787. [PMID: 31566259 DOI: 10.1002/adma.201903787] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/29/2019] [Indexed: 06/10/2023]
Abstract
Recent advances in nanofabrication technologies have spurred many breakthroughs in the field of photonic metamaterials that provide efficient ways of manipulating light-matter interaction at subwavelength scales. As one of the most important applications, photonic metamaterials can be used to implement novel optical absorbers. First the morphology engineering of various photonic metamaterial absorbers is discussed, which is highly associated with impendence matching conditions and resonance modes of the absorbers, thus directly determines their absorption efficiency, operational bandwidth, incident angle, and polarization dependence. Then, the recent achievements of various interdisciplinary applications based on photonic metamaterial absorbers, including structural color generation, ultrasensitive optical sensing, solar steam generation, and highly responsive photodetection, are reviewed. This report is expected to provide an overview and vision for the future development of photonic metamaterial absorbers and their applications in novel nanophotonic systems.
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Affiliation(s)
- Lei Feng
- National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Pengcheng Huo
- National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Yuzhang Liang
- National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Ting Xu
- National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
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