Article
Physics, Applied
Shuxian Chen, Junyi Li, Zicong Guo, Li Chen, Kunhua Wen, Pengbai Xu, Jun Yang, Yuwen Qin
Summary: In this study, plasmon-induced transparency (PIT) in a graphene metamaterial is explored through numerical simulations and theoretical analysis. The proposed structure allows dynamic regulation of the PIT window by adjusting the Fermi level of the graphene, with a modulation depth of 90.4%. The refractive index sensitivity of the PIT window is found to be 1.335 THz RIU-1.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Yuhui Li, Yiping Xu, Jiabao Jiang, Liyong Ren, Shubo Cheng, Bingchuan Wang, Xianwen Zhou, Ziyi Wang
Summary: A novel graphene-based metamaterial structure is proposed to achieve dual dynamically tunable plasmon-induced transparency (PIT) and plasmon-induced absorption (PIA) effects, which can be controlled by adjusting bias voltage and the distance between graphene layers. The distribution of electric field intensity in the metamaterial and the dispersion properties of surface plasmon polaritons (SPPs) in graphene have been studied, showing good consistency between theoretical analysis and numerical simulation methods. The proposed metamaterial shows potential applications in absorbers, tunable switches, and slow light devices.
Article
Chemistry, Multidisciplinary
Gongli Xiao, Sitong Zhou, Hongyan Yang, Zhixiong Lin, Haiou Li, Xingpeng Liu, Zanhui Chen, Tangyou Sun, Peihua Wangyang, Jianqing Li
Summary: In this study, a graphene metasurface-based and multifunctional polarization beam splitter that is dynamically tunable was proposed. The unique structure of the splitter enables triple plasma-induced transparency (PIT), and synchronous or asynchronous six-mode electro-optical switching modulation can be achieved by modifying the Fermi levels of graphene. Furthermore, by varying the polarization angle, a polarization-sensitive, tunable polarization beam splitter was realized.
Article
Physics, Applied
Min Li, Cuixiu Xiong, Chao Liu, Biao Zeng, Banxian Ruan, Baihui Zhang, Enduo Gao, Hongjian Li
Summary: In this paper, an easily implemented monolayer graphene structure is proposed for achieving triple plasmon-induced transparency and absorption effects. By altering the Fermi energy and carrier mobility of graphene, the absorption intensity can be dynamically controlled over a broadband frequency range. The triple plasmon-induced absorption spectrum shows 20 times more absorption bands compared to monolayer graphene, with a sensitivity of 0.4 THz RIU-1 for terahertz plasmonic sensing applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Banxian Ruan, Chao Liu, Cuixiu Xiong, Min Li, Baihui Zhang, Enduo Gao, Kuan Wu, Hongjian Li
Summary: The study investigated a grating coupled graphene surface plasmon and planar waveguide structure, revealing a sharp asymmetric Fano resonance attributed to the coupling between graphene plasmon and waveguide mode. The physical origin of Fano resonance was analyzed, demonstrating tunable properties and potential applications in light absorption and refractive index sensing. The proposed Fano resonance shows promise in developing functional devices for excellent light absorption and refractive index sensing.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Hong-Fei Liu, Jian-Xin Wu, Ji-Ren Yuan, Xin-Hua Deng
Summary: The study demonstrates that a graphene-based metamaterial structure with a graphene/SiC defect layer can achieve perfect THz absorption, with absorption peak value and frequency controllable by adjusting gate voltage and SiC thickness. Additionally, the absorption properties of the structure are insensitive to incident angle and period number.
Article
Optics
Yi Zeng, Zi-Xiao Ling, Gui-Dong Liu, Ling-Ling Wang, Qi Lin
Summary: This study proposes a graphene metamaterial embedded into gain-assisted medium, which exhibits electromagnetically induced transparency-like spectra. The transmission characteristics of the metamaterial are quantitatively described using the transfer matrix method and temporal coupled-mode theory. By tuning the gain level and Fermi energy level, the transmission characteristics can be controlled. The optimized incorporation between gain medium and graphene nanoribbons results in destructive interference between high order graphene plasmonic modes, leading to significant phase transition with giant group delay and ultra-high group index.
Article
Chemistry, Physical
Bo Ni, Guangsuo Tai, Haibin Ni, Lingsheng Yang, Heng Liu, Lingli Huang, Jiang Wang, Jianhua Chang
Summary: This paper proposed a plasmon-induced transparency effect based on an asymmetric graphene loop structure, which can achieve frequency tuning and amplitude modulation by adjusting the geometric parameters and Fermi level of graphene, showing promising applications in optical devices.
Article
Optics
Hao Zhang, Biao Zeng, Enduo Gao, Pengju Yao, Chao Liu, Hongjian Li
Summary: By proposing a simple dual-layer graphene metamaterial, the PIT windows of PIT-based sensors can be effectively modulated by changing the Fermi energy and the parameters of the graphene strips. The physical mechanism of PIT is demonstrated using Coupled mode theory (CMT), and the relationship between sensing performance and device parameters is described through charts, showing high sensitivity and a maximum figure of merit (FOM).
OPTICS COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Boyun Wang, Jie Yang, Qingdong Zeng, Geng Li, Huaqing Yu, Fang Chen, Chunchao Yu, Tao Wang
Summary: In this article, the dynamically tunable multiple plasmon-induced transparency (PIT) effect in a monolayer graphene structure system with rectangular defect cavities is investigated. The results show that the group index of the system can be controlled by adjusting the Fermi level of graphene, and it can reach a maximum value of 812 at 1.2 eV, indicating excellent slow light characteristics.
Article
Optics
Xinyi Wang, Chi Ma, Lihua Xiao, Xia Li, Jiabin Yu, Binggang Xiao
Summary: The study introduces a difunctional compound that can switch between an absorber and a reflector as needed. Simulation results show that the device has a high absorption rate in a specific frequency range, making it suitable for a wide range of applications in infrared spectrophotometers.
Article
Nanoscience & Nanotechnology
Jun Wu, Xiuwei Yang, Zhongmin Wang, Biyuan Wu, Xiaohu Wu
Summary: This study investigates tunable multichannel perfect absorption in monolayer graphene at terahertz frequencies achieved by depositing a graphene monolayer on a Fibonacci quasiperiodic multilayer structure. The absorptivity is attributed to the graphene Tamm plasmon polaritons and multiple photonic stopbands of dielectric Fibonacci multilayers. The multichannel operating frequencies can be flexibly tuned through varying the angle of incidence and structure dimensions, and the absorption is not sensitive to the polarization state.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Physics, Multidisciplinary
Zi-Hao Zhu, Bo-Yun Wang, Xiang Yan, Yang Liu, Qing-Dong Zeng, Tao Wang, Hua-Qing Yu
Summary: In this study, a dynamically tunable multiband plasmon-induced transparency (PIT) effect is investigated using a graphene nanoribbon waveguide system coupled with rectangle cavities. Single-PIT effect is achieved through destructive interference and indirect coupling, while dual-PIT effect is obtained by side-coupling three rectangle cavities with a graphene nanoribbon waveguide. The combination of bright-dark mode coupling and cavities side-coupled with waveguide mechanism leads to triple-PIT effect. This research introduces a novel approach for the realization of optical sensors, filters, and slow light devices with ultra-compact and dynamic tunable characteristics.
Article
Chemistry, Multidisciplinary
Xu Zhong, Tiesheng Wu, Zhihui Liu, Dan Yang, Zuning Yang, Rui Liu, Yan Liu, Junyi Wang
Summary: In this study, a graphene plasmonic structure was proposed to achieve dual tunable electromagnetically induced transparency (EIT)-like effect at terahertz frequencies, showing good slow light performance. The group delay of the structure reached 0.62 ps, the group refractive index exceeded 1200, and the EIT-like peak frequency transmittance was up to 0.89.
Article
Materials Science, Multidisciplinary
Shuxian Chen, Liang Zeng, Jiaqi Li, Jun Weng, Junyi Li, Zicong Guo, Pengbai Xu, Wenjie Liu, Jun Yang, Yuwen Qin, Kunhua Wen
Summary: The paper proposes a graphene-based metamaterial structure that generates the plasmon-induced transparency (PIT) effect. The physical properties and performance of the structure in an optical switch are analyzed, and the results demonstrate high modulation depth, polarization extinction ratio, and the potential for achieving dual and triple PIT effects.
RESULTS IN PHYSICS
(2022)
