Article
Optics
Jie Chen, Yang Fan
Summary: The study investigates topological Bloch-Zener oscillations for surface plasmon polaritons in a Su-Schrieffer-Heeger plasmonic system with graphene dimer arrays. Topological transition from trivial to non-trivial phase is achieved by alternating gain and loss in the graphene waveguide arrays. Zener tunneling of SPP beam is observed in the parity-time symmetric region.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Weijing Kong, Qinyu Liu, Rongguo Yin, Xiaochang Ni
Summary: To enhance the electric-field confinement capability of Bloch surface wave (BSW) with low propagation loss, a high-performance hybrid BSW waveguide is developed by incorporating a high-index nano-ridge loaded photonic crystal slab with a silicon dielectric nanowire. The mode hybridization enables subwavelength mode confinement along with long-range waveguiding. The robust properties of the proposed waveguide against fabrication imperfections and its improved guiding performance compared to similar configurations are discussed, indicating its potential for building high-performance nanophotonic devices.
OPTICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Miao Sun, Zhuanling He, Xiaohong Lan, Libing Huang
Summary: This paper proposes a hybrid plasmonic waveguide structure composed of graphene-coated nanotube and a dielectric substrate, and demonstrates its potential applications in nanophotonic devices by studying its transmission properties.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Physics, Applied
Fangyuan Liu, Tuyu Yin, Yu Liu, Iqbal Naeem, Dan Guo, Libin Cui, Tianrui Zhai
Summary: In this work, multiple-beam colloidal quantum dot lasers are achieved in a double waveguide-grating (W-G-W) microcavity using interference lithography. The low-threshold multiple-beam laser output with emission peaks at 664.6 and 645.2 nm is realized under optical pumping. The presence of quasi-propagation modes provides a method for designing compact laser sources.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Timothy J. Palinski, Brian E. Vyhnalek, Gary W. Hunter, Amogha Tadimety, John X. J. Zhang
Summary: This study demonstrates a platform for the active switching of hybrid plasmonic-photonic Fano resonances, achieving on/off switching of narrow Fano resonance transparency windows with high contrast and tunability across a wide spectral range by modulating refractive index. The structure includes gold nanogratings sandwiched between two dielectric thin films, and controlling the interaction of substrate and superstrate modes through refractive index tuning enables both spectral and spatial selectivity.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Da Teng, Kai Wang
Summary: The study investigates the waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide using effective-index method and finite element method. It examines modal properties such as effective mode index, modal loss, cut-off characteristics of higher order modes, and shows the potential for tuning the fundamental mode by modulating the Fermi level. Additionally, it validates the accuracy of the effective-index method and studies crosstalk between adjacent waveguides for determining device integration density.
Article
Engineering, Electrical & Electronic
Muzzamal Iqbal Shaukat, Montasir Qasymeh, Hichem Eleuch
Summary: This study investigates the emergence of solitons in plasmonic graphene waveguides in the presence of optical and microwave fields. Electronically controlled coupled optical solitons can be achieved by altering the self- and cross-modulation terms through proper electrical biasing and doping concentration.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Xiangzhuang Kong, Jinhua Li, Youqiao Ma
Summary: In this study, a graphene-based all-dielectric waveguide modulator with offset nanowires was proposed and theoretically demonstrated, showing enhanced field modulation effect by adjusting the displacement between the nanowires. Simulation results indicate high modulation depth and coverage across various bands, showcasing significant potential for long-wave integrated modulators and optoelectronic devices.
OPTICAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Vaishnavi Sajeev, Shreeya Rane, Debal Ghosh, Nityananda Acharyya, Palash Roy Choudhury, Arnab Mukherjee, Dibakar Roy Chowdhury
Summary: Due to their unique optoelectronic properties, two-dimensional (2D) materials have attracted significant attention. In this study, we explored the use of sub-wavelength dipole cavities as a sensing platform for detecting reduced graphene oxide (r-GO) using terahertz time-domain spectroscopy (THz-TDS). The structural characteristics of r-GO were verified using X-ray diffraction (XRD) and Raman spectroscopy, while scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), and Fourier Transformed Infrared (FTIR) spectroscopy were used to assess its morphology and chemistry. The sensitivity of the porous r-GO film was found to be 12 GHz/mu m. This research presents a novel approach that can be expanded to detect other 2D materials, leading to the development of new THz nanophotonic sensing devices.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Ryan D. McCurdy, Aidan Delgado, Jingwei Jiang, Junmian Zhu, Ethan Chi Ho Wen, Raymond E. Blackwell, Gregory C. Veber, Shenkai Wang, Steven G. Louie, Felix R. Fischer
Summary: Metallic graphenenanoribbons (GNRs) are essential for low-dimensional functional materials technology as 1D interconnects for electronic and quantum information transport. However, the design and assembly of metallic GNRs have been hindered by the structural constraints in on-surface bottom-up synthesis and limited control over the orientation and sequence of asymmetric monomer building blocks during polymerization. In this study, we report the successful synthesis of GNRs with robust metallic states by embedding a symmetric zero-mode superlattice along the backbone.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Optics
Mohsen Samadi, Pooya Alibeigloo, Abolfazl Aqhili, Mohammad Ali Khosravi, Farahnaz Saeidi, Shoaib Vasini, Mostafa Ghorbanzadeh, Sara Darbari, Mohammad Kazem Moravvej-Farshi
Summary: Plasmonic tweezers are indispensable tools for manipulating micro and nano-objects with high precision, utilizing surface plasmon technology to trap particles beyond the diffraction limit. Trapping-potential landscape can be reconfigured by designing plasmonic nanostructures.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Physical
Chengdong Tao, Chuanbao Liu, Yongliang Li, Weili Fan, Yanjing Su, Lijie Qiao, Ji Zhou, Yang Bai
Summary: Graphene plasmons (GPs) are efficiently excited and actively controlled using resonant graphene nanoantennas (GNAs). Spatially engineered GNAs enable tunable directional GP launchers and graphene plasmonic circuits.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Victor Pacheco-Pena, Toby Hallam, Noel Healy
Summary: MXenes, as an emerging class of two-dimensional materials, show significant potential for use in next generation optoelectronic sensors. By tuning the plasma frequencies, they can produce plasmon resonances across different spectral ranges, adding a degree of freedom to the sensing mechanism.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Zhiqi Li, Yizhuo Zhang, Xiaowang Guo, Chenghao Tong, Xiaoying Chen, Yu Zeng, Jian Shen, Chaoyang LI
Summary: The operator approach to effective medium approximation (OEMA) is used to characterize the metal-dielectric multilayer structures in hyperbolic metamaterial (HMM) based sensors. Short-range (SR) and long-range (LR) modes are derived based on the propagation length of bulk high K waves in HMM. A high-sensitivity refractive index sensor is designed for the near-infrared SR mode resonance, and the effects of various factors on the SR mode resonance are analyzed. The designed structure achieves a maximum sensitivity of 330 mu m/RIU with a quality factor of 492 RIU-1 in the near-infrared band.
Article
Optics
Shicheng Zhu, Lin-Lin Su, Jun Ren
Summary: This study demonstrates the efficient tuning of incoherent and coherent coupling between emitters in an epsilon-near-zero (ENZ) waveguide coated with multilayer graphene. A tunable two-qubit quantum phase gate is achieved at the ENZ waveguide's cutoff frequency. The vanishingly small permittivity of the ENZ waveguide allows for near-ideal bipartite and multipartite entanglement, while the coherent coupling and energy transfer efficiency can be effectively tuned by the Fermi level of graphene.
Article
Chemistry, Physical
Shuaihao Tang, Liang Xu, Bojun Peng, Feilong Xiong, Tong Chen, Xin Luo, Xin Huang, Haotian Li, Jian Zeng, Zongle Ma, Ling-Ling Wang
Summary: This study systematically investigated the effect of Ga doping on the performance of Pd/CeO2 SACs system using DFT calculations and transition state theory. Ga doping significantly enhanced the stability of Pd single atoms and promoted the catalytic performance of the CO oxidation reaction effectively. This work provides a new perspective for SACs modification.
APPLIED SURFACE SCIENCE
(2022)
Review
Physics, Applied
Xin Luo, Yuanguo Zhou, Yijun Cai, Ziqiang Cheng, Zhimin Liu, Wenqiang Wan
Summary: Due to their unique properties, two-dimensional (2D) materials have attracted extensive attention. However, the low optical absorption efficiencies of most 2D materials limit their applications in optoelectronic devices. Enhancing the light-matter interaction of 2D materials in the visible and near-infrared regimes has become a key topic. This topical review summarizes the recent developments of 2D materials-based optical absorbers, focusing on the methods and physical mechanisms of different types of perfect absorbers.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Yipeng Qin, Fengqi Zhou, Zhimin Liu, Xiao Zhang, Shanshan Zhuo, Xin Luo, Cheng Ji, Guangxin Yang, Zizhuo Zhou, Liwen Sun, Ting Liu
Summary: In this study, a terahertz-band metamaterial composed of multilayer patterned graphene is proposed, and triple plasmoninduced transparency is achieved by coupling three bright modes with one dark mode. The results show that dynamic tuning and multimode electro-optics switching can be achieved by changing the Fermi level, enabling the design of synchronous and asynchronous electro-optics switches.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Optics
Zhiyong Wang, Yanghong Ou, Shiyu Wang, Yanzi Meng, Zi Wang, Xiang Zhai, Lingling Wang, Shengxuan Xia
Summary: In this paper, an easy-to-implement metamaterial absorber based on bulk Dirac semimetal is presented. The device achieves ultrahigh quality factor and excellent sensing performance, with precise control over resonance wavelength by adjusting the parameters. It has high-performance applications in terahertz filtering, detection, and biochemical sensing.
Article
Optics
Shanshan Zhuo, Fengqi Zhou, Yanli Liu, Zhimin Liu, Xiao Zhang, Xin Luo, Yipeng Qin, Guangxin Yang, Cheng Ji, Zizhuo Zhou, Liwen Sun, Ting Liu
Summary: This paper proposes a simple monolayer graphene metamaterial based on silicon/silica substrates, which achieves typical triple-plasmon-induced transparency (PIT) in the terahertz band. The physical mechanism is analyzed using coupled mode theory (CMT), and the results are in good agreement with finite-difference time-domain simulation. By dynamic tuning, a multimode electro-optical switch can be designed with high modulation degrees of its resonant frequencies. Additionally, the graphene metamaterial exhibits slow light effects with a group index reaching 770 at Ef = 0.8 eV. These results are of great significance for the research and design of electro-optical switches and slow light devices in the terahertz band.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Optics
Wenfeng Xiao, Yanghong Ou, Shiyu Wang, Shuai Wang, Yanzi Meng, Xiang Zhai, Shengxuan Xia, Lingling Wang
Summary: In this paper, a metamaterial sensor based on stacking gold and silicon dioxide is proposed, which achieves narrow-band absorption and improved figure of merit. The sensor exhibits excellent sensing performance and benefits the design of multi-band photodetectors and high-sensitivity sensors due to its mature manufacturing technology.
Article
Engineering, Electrical & Electronic
Wei Xu, Hongbo Cheng, Xin Luo, Ziqiang Cheng, Chan Ke, Xiang Zhai
Summary: In this paper, a tunable all dielectric perfect absorber based on hybrid graphene-dielectric metasurface is proposed to overcome the limitations of metal-based optical absorbers. The structure achieves perfect absorption at the wavelength of 9059 nm by exciting magnetic dipole and electric dipole modes that meet the condition for degenerate critical coupling, and the absorption can be dynamically adjusted by changing the Fermi energy of graphene film. The all dielectric structure exhibits polarization insensitivity and maintains good performance under wide angles of incidence, showing great potential in photovoltaic and thermal detection applications.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
S. H. A. N. S. H. A. N. Zhuo, Z. H. I. M. I. N. Liu, F. E. N. G. Q. Zhou, Y. I. P. E. N. G. Qin, X. I. N. Luo, C. H. E. N. G. Ji, G. U. A. N. G. X. I. N. Yang, R. U. I. H. A. N. Yang, Y. A. D. O. N. G. Xie
Summary: This paper proposes a novel absorber based on patterned graphene and vanadium dioxide hybrid metamaterial, which achieves wide-band perfect absorption and dual-channel absorption in the terahertz band. The absorber shows great potential in increasing high absorption width and functioning as a multifunctional modulator.
Article
Optics
Sheng-xuan Xia, Di Zhang, Zizhuo Zheng, Xiang Zhai, Hongju Li, Jian-qiang Liu, Ling -Ling Wang, Shuang-chun Wen
Summary: In this Letter, the theoretical study of topological plasmons in Su-Schrieffer-Heeger (SSH) model-based graphene nanoribbon (GNR) layers is conducted. It is found that in the one-dimensional (1D) stacked case, only two topological modes exist, with the field localized in the top or bottom layer, as predicted by the Zak phase. Expanding the stacked 1D GNR layers to two-dimensional (2D) arrays in the in-plane direction, the topology is characterized by the 2D Zak phase, predicting the emergence of three kinds of topological modes: topological edge, surface, and corner modes. This work provides a platform for realizing topological modes in GNRs and has importance for the design of topological photonic devices such as lasers and sensors.
Article
Optics
Guangxin Yang, Zhimin Liu, Fengqi Zhou, Shanshan Zhuo, Yipeng Qin, Xin Luo, Cheng Ji, Yadong Xie, Ruihan Yang
Summary: This study proposes a single-layer graphene metamaterial consisting of a horizontal graphene strip, four vertical graphene strips, and two graphene rings. The tunable multi-plasma-induced transparency (MPIT) is realized by adjusting the Fermi level of graphene, achieving a switch with three modulation modes. The effect of symmetry breaking on MPIT is also investigated, and the conversion between triple-PIT, dual-PIT, and single-PIT is demonstrated. The proposed structure and findings provide guidance for designing photoelectric switches and modulators.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2023)
Article
Physics, Applied
Sheng-Xuan Xia, Di Zhang, Xiang Zhai, Ling-Ling Wang, Shuang-Chun Wen
Summary: In this Letter, the authors report on phase-controlled topological plasmons in 1D graphene nanoribbons based on a variant of the Su-Schrieffer-Heeger (SSH) model. They investigate the normal SSH model and reveal the existence of edge modes with nontrivial topology, which exhibit strong field confinement and extreme frequency stability. The authors also introduce an offset SSH model variant that allows for engineering the width of the topological gap and the number of topological windows. The findings provide insight into the physics of topologically protected graphene plasmons and offer potential applications in designing plasmon devices with immunity to structural imperfections.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Cheng Ji, Zhimin Liu, Fengqi Zhou, Xin Luo, Guangxin Yang, Yadong Xie, Ruihan Yang
Summary: A monolayer metamaterial consisting of a rectangle graphene strip and four L-shaped graphene blocks was proposed to achieve a quintuple plasmon-induced transparency. By modulating the Fermi energy level of graphene, an octuple-frequency asynchronous switch and a sextuple-frequency synchronous switch were designed and studied, which exhibited excellent modulation degree (up to 97.7%), extinction ratio (up to 16.41 dB), insertion loss (low to 5.4%), and dephasing time (low to 3.86 ps). The proposed metamaterials showed polarization-sensitive characteristics due to their non-central symmetry and had a high group index of 604, indicating a good slow light effect and potential use for optical storage.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Zhengdao Xie, Guoli Li, Shengxuan Xia, Chang Liu, Sen Zhang, Zhouxiaosong Zeng, Xingqiang Liu, Denis Flandre, Zhiyong Fan, Lei Liao, Xuming Zou
Summary: This paper examines the ultimate limit in optoelectronic performances of monolayer WSe2 FETs by constructing a sloping channel. By using a simple scaling method compatible with current micro/nanofabrication technologies, a record-high saturation current of 1.3 mA/μm at room temperature is achieved, surpassing any reported monolayer 2D semiconductor transistors. Additionally, quasi-ballistic transport and high saturation velocity make WSe2 FETs suitable for extremely sensitive photodetectors.
Article
Materials Science, Multidisciplinary
Shengxuan Xia, Xiang Zhai, Lingling Wang, Yuanjiang Xiang, Shuangchun Wen
Summary: In this paper, a theoretical scheme is proposed to achieve unidirectional odd-to-even order plasmonically induced transparency (PIT) by establishing a model with two layers of periodic graphene nanoribbons. The underlying physical principles are uncovered by predicting the positions of phase difference, and the proposed PIT concept is demonstrated to have good robustness against both ribbon width and relative ribbon positions.
Article
Materials Science, Multidisciplinary
Hongju Li, Gangao Wei, Hongmiao Zhou, Haixiao Xiao, Meng Qin, Shengxuan Xia, Feng Wu
Summary: This study demonstrates a specially designed TMD Huygens metasurface that overcomes the absorption limit of a subwavelength thin film, achieving a super-high absorption rate of up to 87%. The metasurface can control the absorption rate throughout the entire near-infrared region, regardless of polarization and angle, offering important potential applications.
