Mr. Jian Zhang Profile

Jian Zhang

at Communication Univ of China

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Proceedings Article | 1 November 2021 Paper

Design and simulation of electromagnetically induced transparent structure based on terahertz metamaterials

Jian Zhang, Ying Li, Bin Li

Proceedings Volume 12057, 120572V (2021) https://doi.org/10.1117/12.2606122

KEYWORDS: Metamaterials, Electromagnetism, 3D modeling, Terahertz metamaterials, Slow light, Transparency, Terahertz radiation, Electromagnetic radiation, Dielectrics

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A three-dimensional structure device that realizes electromagnetic-induced transparency (EIT) in the terahertz band is designed. We use metamaterials to simulate electromagnetic-induced transparency phenomena, through the design of effective metamaterial unit structures, acquire high transmittance while achieving strong dispersion, reducing the absorption of light waves by the medium in the slow light process. EIT’s frequency response is expressed as a narrowband transparent window formed in a large block peak. There are two coupling methods for metamaterials to achieve EIT: bright-bright mode coupling and bright-dark mode coupling. Obviously, the structures in the bright-mode coupled metamaterial unit can be directly excited by incident waves to form a resonant mode, that is, there are at least two radiating mode resonators, which are generally two-dimensional planar structures such as double strips, double rings, etc. This work breaks through the traditional planar patch structure, connects the two resonant rings with cylinders, and innovatively constructs a three-dimensional metamaterial unit. We successfully achieve EIT in the range of 1.06THz to 1.41THz, at a resonance frequency of 1.26THz, the two narrow-band resonance peaks of EIT are located at 1.22THz and 1.30 THz. Realizing EIT through terahertz metamaterials, thereby realizing slow light effect, have paved the way for the design of slow-light devices to meet the future demand for ultra-fast optical signal processing and promote the development of next-generation communication technologies.

Proceedings Article | 1 November 2021 Paper

Design and analysis of terahertz EIT structure based on cross split ring

Ying Li, Jian Zhang, Bin Li

Proceedings Volume 12057, 120571V (2021) https://doi.org/10.1117/12.2605593

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Electromagnetic induced transparency (EIT) was first discovered in the three energy levels atomic system, and its excellent electromagnetic and optical properties are fascinating, which has aroused the research interest of many scholars. In this paper, a cross-double-ring resonant unit with four openings(CDRFO) is designed. Through numerical calculation, the metamaterial formed by this unit can produce electromagnetically induced transparent window at 3.29THz frequency, and the reflection peaks on both sides can be adjusted independently by changing the parameters. At the same time, the structure is insensitive to polarization, and has strong angular stability. That can produce strong dispersion and group delay in the corresponding 3.12~3.4THz frequency band, which will slow down the propagation speed of optical pulses. The mechanism of EIT phenomenon is further discussed by studying the structural parameters of the resonant unit. The two resonant peaks near the window are directly excited by the incident wave, which belongs to the bright-bright mode excitation of electromagnetic induced transparency. Finally, by studying the cross arm part of the structure, a new excitation mode based on the bright-bright mode is proposed according to the phase coupling principle. Terahertz electromagnetically induced transparency is of great help to the research of slow light and even optical buffer devices, and can promote the development of next generation communication technology——6G.

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