Article
Chemistry, Multidisciplinary
Chia-Hung Wu, Chih-Jen Ku, Min-Wen Yu, Jhen-Hong Yang, Pei-Yuan Wu, Chen-Bin Huang, Tien-Chang Lu, Jer-Shing Huang, Satoshi Ishii, Kuo-Ping Chen
Summary: This study explores plasmonic photodetection using graphene as a 2D material, achieving non-scattering near-field detection of surface plasmon polaritons. The maximum photoresponsivity is 29.2 mA W-1, and the polarization state of the input light produces a 400% contrast. This has potential applications in on-chip optoelectronic circuits.
Article
Materials Science, Multidisciplinary
Yunyang Ye, Xinye Zhang, Leyong Jiang
Summary: This paper achieves magnetically tunable Goos-Hanchen (GH) shift of a reflected beam at terahertz frequencies using a multilayer structure with anisotropic graphene. The GH shift is enhanced by exciting graphene surface plasmon polaritons at the interface between two dielectric materials. By considering the quantum response of graphene, the GH shift can be switched from negative to positive and actively tuned through an external magnetic field or controlling structural parameters. This enhanced and tunable GH shift has promising applications in graphene-based terahertz shift devices and nanophotonics.
Article
Materials Science, Multidisciplinary
Yunping Qi, Chuqin Liu, Bingbing Hu, Xiangyu Deng, Xiangxian Wang
Summary: A tunable selective absorber consisting of periodic arrow-shaped graphene arrays operating in the far infrared and terahertz range is proposed by depositing a set of arrow-shaped graphene ribbons on a SiO2 dielectric spacer. The research shows that increasing both the Fermi level and relaxation time significantly enhances the absorption performance, with a nearly 12-fold improvement when both parameters are increased simultaneously. Additionally, increasing the relaxation time from 0.1 ps to 1.0 ps results in an increase in the maximum absorption peak value.
RESULTS IN PHYSICS
(2021)
Article
Optics
Yingqiu Zhang, Xing Liu, Qiaohua Wu, Wenfeng Li, Chunlei Li
Summary: In this study, a graphene plasmon waveguide composed of a silicon grating substrate and a silica separator is proposed to achieve the slow-light effect. By applying a bias voltage, the optical conductivity of graphene can be tuned, allowing for tunability of the working channel. The increase in bias voltage leads to a linear blue-shift in the working channel, with a high linear correlation coefficient. The normalized delay bandwidth product (NDBP) was found to have an average value of 3.61, demonstrating the potential of this miniaturized waveguide structure for various applications such as optical storage devices, optical buffers, and optical switches.
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
Materials Science, Multidisciplinary
Zhendong Yan, Lei Gao, Chaojun Tang, Bin Lv, Ping Gu, Jing Chen, Mingwei Zhu
Summary: We study the simultaneous narrowband and broadband light absorption enhancement of monolayer graphene on a metallic substrate with a periodic array of small holes. The absorption peaks of graphene are proven to stem from the hybrid modes of delocalized surface plasmon polaritons propagating on the substrate surface and localized magnetic plasmons confined within individual holes. The positions, maxima, and bandwidths of the absorption peaks can be tuned through changing the hole array period. The maximum absorption values at the narrowband and broadband peaks can reach up to 65% and 85%, respectively. The bandwidths of the absorption peaks can be conveniently adjusted, with the narrowband peak reduced to several nanometers and the broadband peak expanded to tens of nanometers.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Mengfei Xue, Ke Chen, Yuchuan Xiao, Yunpeng Qu, Debo Hu, Jianing Chen, Zhipei Sun, Peining Li, F. Javier Garcia de Abajo, Qing Dai
Summary: Negative refraction is achieved using hybrid topological polaritons in van der Waals heterostructures, allowing for gate-tunable manipulation of mid-infrared radiation. Wide-angle negatively refracted polaritons are observed in partially decorated a-MoO3 films with graphene, demonstrating reversible nanoscale focusing. This technique offers possibilities for electrically tunable super-resolution imaging, nanoscale thermal manipulation, enhanced molecular sensing, and on-chip optical circuitry.
Article
Chemistry, Physical
Haixia Xu, Mingli Yang, Yihang Chen
Summary: In this study, a strong coupling system consisting of a polar dielectric GaAs nanolayer and a graphene sheet is proposed. Both the epsilon-near-zero (ENZ) mode and graphene plasmon (GP) mode can be excited in this system and strongly couple with each other. The hybridized ENZ-GP modes exhibit long propagation length and strong optical field confinement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Applied
Zhiguo Li, Qiang Zhao, Pingping Chen, Jiqing Wang
Summary: This study proposes a quantum well micro-cavity structure based on graphene, which can highly tune the plasmonic effect and enhance the absorption performance of the device.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Materials Science, Multidisciplinary
Yindi Wang, Hongxia Liu, Shulong Wang, Ming Cai
Summary: This paper presents a waveguide-integrated graphene-based modulator with excellent performance, including 100% modulation depth, low power dissipation, small device size, and wide bandwidth. The modulator shows robustness and tolerance to fabrication errors, making it highly promising in the field of optoelectronic integrated circuits.
Article
Physics, Multidisciplinary
Mengchao Guo, Xiaokun Wang, Haiyan Zhuang, Dongming Tang, Baoshan Zhang, Yi Yang
Summary: In this paper, high-contrast gratings based spoof surface plasmon polaritons (HCG-based SSPPs) are used to enhance the bandwidth of all-dielectric metamaterial absorbers (ADMMAs). A carbon black composite is used to design a broadband ADMMA, which consists of a cylinder array structure. Simulation results show that a broadband absorption from 6.1 GHz to 18 GHz is achieved with three absorption peaks under a total thickness of 3.9 mm. The first peak is attributed to HCG-based SSPPs, while the other two are attributed to diffraction effects. The improved impedance matching characteristic in a wide band also contributes to the enhancement. Experimental results roughly agree with the simulations. Moreover, the designed structure is not a standard HCG, indicating the potential universality of HCG-based SSPPs in ADMMAs. It is believed that this work will stimulate further research on the applications of HCG-based SSPPs in ADMMAs.
Article
Physics, Applied
Xuewei Zhang, Shaobin Liu, Kun Liao, Jian Lou
Summary: In this paper, a novel ultra-wideband high-efficiency bandpass filter based on a surface plasmonic waveguide (SPW) is proposed. By using glide symmetry technology, the filter achieves higher propagation constant and efficient transmission. A prototype has been manufactured and measured, showing good agreement with simulations.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Chunzhen Fan, Yuanlin Jia, Peiwen Ren, Wei Jia
Summary: Graphene metamaterials have achieved tunable plasmon-induced transparency and multispectral transparency in the THz region. The number of optical resonant peaks can be flexibly altered with the designed strip length, and multispectral transparency can also be dynamically tuned via Fermi energy. These active and switchable graphene metamaterials show promise in applications such as optical filters, switchers, and sensors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
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, Multidisciplinary
Jehan Akbar, Xu Bin, Lianping Hou, John H. Marsh, Xuefeng Liu
Summary: Surface plasmon polaritons (SPPs) are excited at the interface of sodium and graphene media through effective control of their dielectric functions. The absorption and dispersion behaviors of SPPs waves can be modified by changing the strength and phase of control fields. The controlled SPPs have potential applications in optical tweezers, nano-photonics, plasmonics, and sensing technology.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
