Article
Materials Science, Multidisciplinary
Xueqing He, Tigang Ning, Li Pei, Jingjing Zheng, Jing Li, Jianshuai Wang
Summary: In this paper, a novel graphene-dielectric hybrid plasmonic waveguide (GDHPW) is proposed, with ultra-small mode area and long propagation length achieved by tuning key structural parameters and chemical potential. Low crosstalk properties between two GDHPWs on a substrate are analyzed, and alternative modified structures with optical confinement performances are proposed, serving as fundamental building blocks for various tunable high-density integrated photonic components and devices.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Lufang Liu, Alexey V. Krasavin, Jialin Li, Linjun Li, Liu Yang, Xin Guo, Daoxin Dai, Anatoly V. Zayats, Limin Tong, Pan Wang
Summary: Researchers have developed electrically driven nanoscale optical sources based on metal-insulator-graphene tunnel junctions, with broadband spectral characteristics. These sources utilize electrically driven inelastic tunneling in a silver nanowire integrated with graphene, which excites plasmonic modes in the junction and propagates towards the junction edge with low loss, coupling efficiently to a nanowire waveguide.
Article
Materials Science, Multidisciplinary
M. J. Maleki, M. Soroosh, G. Akbarizadeh
Summary: In this study, a new structure based on surface plasmon polariton propagation is introduced for decode operation in optical circuits. A graphene monolayer is used for terahertz wave transmission, while a silicon ridge helps achieve high confinement. The designed structure shows low loss and long coupling length, controlled by adjusting the graphene chemical potential.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Jinwen Huang, Zhengyong Song
Summary: By utilizing a bilayer graphene waveguide in a thin topas film, this proposed structure achieves a balance between high figure of merit, low propagation loss and long propagation length. It operates in a wide band from 6 THz to 18 THz, with a figure of merit over 200, propagation loss lower than 0.2 dB/mu m, and propagation length beyond 30 mu m.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Anna Theodosi, Odysseas Tsilipakos, Costas M. Soukoulis, Eleftherios N. Economou, Maria Kafesaki
Summary: Graphene is a promising material for nonlinear applications in the THz regime due to its high third order nonlinearity and ability to support surface plasmons. In this study, 2D-patterned graphene-patch metasurfaces are investigated for efficient third harmonic generation. The efficiency is enhanced by aligning the fundamental and third harmonic frequencies with the metasurface resonances, achieved through 2D-patterning that modifies the dispersion of plasmons. High efficiencies of -20dB (1%) for input intensity 0.1 MW/cm(2) are achieved, and the results demonstrate the potential of graphene-based metasurfaces for nonlinear applications.
Article
Optics
Chengcheng Huang, Yonggang Zhang, Lanju Liang, Haiyun Yao, Fu Qiu, Wenjia Liu
Summary: A novel four-band tunable absorber sensor based on graphene is proposed, with the ability to directly control resonant frequencies and achieve absorption rates higher than 99% by adjusting the Fermi level of graphene. The sensor exhibits superior refractive index sensitivity and good linearity, making it highly promising for applications in the biomedical field.
Article
Optics
Haonan Ling, Arnab Manna, Jialiang Shen, Ho-Ting Tung, David Sharp, Johannes Froch, Siyuan Dai, Arka Majumdar, Artur R. Davoyan
Summary: This study investigates the interaction between light and matter in van der Waals MoS2 nanophotonic devices and demonstrates deep subwavelength optical field confinement in nanostructures, which has the potential to significantly reduce the size of integrated photonic devices and opto-electronic circuits.
Article
Nanoscience & Nanotechnology
Victor Dmitriev, Julio Cesar, Geraldo Melo
Summary: A new multifunctional resonant device for THz and far-infrared regions based on surface plasmon-polariton graphene resonator and waveguides is proposed in this paper. The device provides tunable band-pass filter, power divider, and switch functions. It has a wide range of tunability for the central frequency and power ratio between output ports.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2022)
Article
Optics
He Xueqing, Zhai Yuanbo, Li Pengfei
Summary: This study investigates a graphene V-groove hybrid plasmonic waveguide and analyzes the influence of geometric parameters and graphene chemical potential on the fundamental hybrid plasmon mode supported by the structure. By increasing the number of grooves and reducing the chemical potential of graphene, the effective area of the hybrid mode can be effectively compressed, with a reduction of two orders of magnitude compared to the structure without grooves. Although the transmission length is reduced, the figure of merit is increased by 34.5%-88.5%. Additionally, the crosstalk between two adjacent graphene V-groove hybrid plasmonic waveguides is analyzed, and the minimum distance without crosstalk between the waveguides can be reduced to 22 μm by optimizing the groove geometry and adjusting the chemical potential of graphene.
ACTA OPTICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
Qiang Zhou, Pu Zhang, Xue-Wen Chen
Summary: We report a self-consistent quasinormal mode theory for nanometer scale electromagnetism with incorporation of possible nonlocal and quantum effects through quantum surface responses. Our semianalytical modal analysis enables transparent physical interpretation of the spontaneous emission enhancement of a dipolar emitter as well as the near-field and far-field responses of plane-wave excitations in the nanostructures.
Article
Chemistry, Multidisciplinary
Theis P. P. Rasmussen, A. Rodriguez Echarri, F. Javier Garcia de Abajo, Joel D. D. Cox
Summary: The subwavelength plasmonic near-field enhancement is hindered by large ohmic losses in good plasmonic materials, while conventional phase-matching of fields in bulk nonlinear crystals is not suitable for realizing nonlinear optical phenomena on the nanoscale. In contrast, highly-doped graphene supports long-lived, highly-confined, and actively-tunable plasmons, making it an excellent platform for both plasmonics and nonlinear optics. By interfacing multiple graphene nanostructures in close proximity, we can trigger nonlocal effects associated with large gradients in the electromagnetic near field to enhance nonlinear response.
Article
Optics
Arun Kumar Varshney, Nagendra P. Pathak, Debabrata Sircar
Summary: This paper proposes a frequency reconfigurable dielectric lens antenna (DLA) to compensate for high attenuation in the THz region caused by atmospheric losses. The DLA is fed using an aperture coupled graphene plasmonic nanoantenna, with frequency tuning achieved by varying the chemical potential of graphene. The proposed DLA exhibits high gain, narrow beamwidth, high radiation efficiency, and stable input impedance.
Review
Nanoscience & Nanotechnology
Xu Qin, Wangyu Sun, Ziheng Zhou, Pengyu Fu, Hao Li, Yue Li
Summary: The review focuses on the technique of waveguide effective plasmonics, which provides a feasible low-loss realization of plasmonic metamaterials in lower frequency based on the structural dispersion. It highlights the underlying physics of waveguide effective plasmonics and its applications, ranging from classical plasmonic concepts to novel effective plasmonic devices. Additionally, it briefly discusses the future research directions and potential applications.
Article
Optics
Yindi Wang, Hongxia Liu, Shulong Wang, Ming Cai
Summary: A subwavelength electro-optic switch at 1550 nm is proposed, which utilizes bilayer graphene in a hybrid waveguide. The switch shows excellent performance with small device size and low voltage modulation requirement, making it suitable for various applications. Additionally, it has wide bandwidth, low energy consumption, and good robustness, indicating great potential for optoelectronic integrated circuits.
OPTICS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Mohd Farman Ali, Rajarshi Bhattacharya
Summary: In this paper, a tunable high-gain graphene-based terahertz (THz) patch antenna is implemented and numerically studied. The antenna achieves improved gain and radiation efficiency by utilizing a double split ring resonator-shaped frequency selective surface (FSS). Additionally, different sizes of patch antenna sub-arrays are explored for implementing THz massive multi-input-multi-output (MIMO) applications. The antenna response can be tuned by applying an electrostatics DC bias.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
