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Dynamically tunable optical properties in graphene-based plasmon-induced transparency metamaterials

Chinese Physics B 2019年第2期28卷 363-368页

作者： Wei Jia Pei-Wen Ren Yu-Chen Tian Chun-Zhen Fan School of Physical Science and Engineering Zhengzhou University

A graphene-based metamaterial for THz plasmon induced transparency(PIT) is presented and numerically studied in this paper, which consists of two horizontal graphene strips attached to a continuous vertical wire separately. The calculated surface current distributions demonstrate that the distinct PIT window results from the near-field coupling of two bright modes. To explore the physical mechanism of PIT effect, we employ the coupled Lorentz oscillator model. The transmission spectra obtained with this model fits well with the simulation results. The performance of the PIT system can be controlled through the geometry parameters of graphene strips. Moreover, the transparency window can be dynamically tuned by varying the Fermi energy and the carrier mobility of the graphene strips. The slow light effect is also explored in our proposed structure and it can achieve 1.25 ps when Fermi energy is 1.3 eV. Finally, the position of the transmission window with the variation of the nearby medium refractive index is examined. Such a proposed graphene-based PIT system may have great potential applications in photonic devices.

关键词： plasmon-induced transparency graphene tunable

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Graphene Tamm plasmon-induced giant Goos–H?nchen shift at terahertz frequencies

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Chinese Optics Letters 2019年第2期17卷 29-34页

作者： Jiao Tang Jiao Xu Zhiwei Zheng Hu Dong Jun Dong Shengyou Qian Jun Guo Leyong Jiang Yuanjiang Xiang School of Physics and Electronics Hunan Normal University International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education College of Optoelectronic Engineering Shenzhen University Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal University

In this Letter, we have shown that a giant Goos–H?nchen shift of a light beam reflected at terahertz frequencies can be achieved by using a composite structure, where monolayer graphene is coated on one-dimensional photonic crystals separated by a dielectric slab. This giant Goos–H?nchen shift originates from the enhancement of the electrical field, owing to the excitation of optical Tamm states at the interface between the graphene and onedimensional photonic crystal. It is shown that the Goos–H?nchen shift in this structure can be significantly enlarged negatively and can be switched from negative to positive due to the tunability of graphene's conductivity. Moreover, the Goos–H?nchen shift of the proposed structure is sensitive to the relaxation time of graphene and the thickness of the top layer, making this structure a good candidate for a dynamic tunable optical shift device in the terahertz regime.

关键词： Graphene Tamm plasmon-induced

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Nonlinear polaritons in metamaterials with plasmon-induced transparency [Invited]

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Chinese Optics Letters 2019年第1期17卷 100-114页

作者： Zhengyang Bai Qi Zhang Guoxiang Huang State Key Laboratory of Precision Spectroscopy School of Physics and Material Science East China Normal University NYU-ECNU Joint Institute of Physics at NYU-Shanghai

Electromagnetically induced transparency(EIT), a typical quantum interference effect, has been extensively investigated in coherent atomic gases. In recent years, it has been recognized that the plasmonic analog of atomic EIT, called plasmon-induced transparency(PIT), is a fruitful platform for the study of EIT-like propagation and interaction of plasmonic polaritons. Many proposals have been presented for realizing PIT in various metamaterials, which possess many unique characters, including the suppression of absorption of electromagnetic radiation, the reduction of propagation velocity, etc. Especially, nonlinear PIT metamaterials, obtained usually by embedding nonlinear elements into meta-atoms, can be used to acquire an enhanced Kerr effect resulted from the resonant coupling between radiation and the meta-atoms and to actively manipulate structural and dynamical properties of plasmonic metamaterials. In this article, we review recent research progress in nonlinear PIT metamaterials, and elucidate their interesting properties and promising applications. In particular, we give a detailed description on the propagation and interaction of nonlinear plasmonic polaritons in metamaterials via PIT,which are promising for chip-scale applications in information processing and transmission.

关键词： Invited Nonlinear polaritons metamaterials plasmon-induced transparency

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plasmon-enhanced visible photocatalytic activity of mesoporous Au-TiO2 composite nanoparticles

Plasmon-enhanced visible photocatalytic activity of mesoporo...

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中国化学会第27届学术年会

作者： Ming-Hua Zhoua b Jia-Guo Yub* aInstitute of Medical Chemistry Yunyang Medical College Shiyan 442000 Hubei P. R. China b State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China.

＜正＞Mesoporous Au-TiO2 composite nanoparticles （NPs） with high specific surface area and good photocatalytic activity were fabricated by a simple spray hydrolytic method

关键词： plasmon-induced Au-TiO2 Hydroxyl radical Visible photocatalytic activity

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