Guangyuan Li
Chinese Academy of Sciences
Polarization (waves)ResonanceTerahertz radiationPlasmonAutomatonOpticsPhysicsFigure of meritDielectricSurface plasmonSurface plasmon polaritonNonlinear systemMaterials sciencePlasmonic waveguideWaveguide (optics)Computer scienceRefractive indexOptoelectronicsBroadbandWavelength
128Publications
16H-index
1,086Citations
Publications 124
Newest
#1Xiao-Qing LuoH-Index: 7
#2Fangrong HuH-Index: 21
Last. Guangyuan LiH-Index: 16
view all 3 authors...
Dynamically switchable half-/quarter-wave plates have recently been the focus in the terahertz regime. Conventional design philosophy leads to multilayer metamaterials or narrowband metasurfaces. Here we propose a novel design philosophy and a VO2-metal hybrid metasurface for achieving broadband dynamically switchable half-/quarter-wave plate (HWP/QWP) based on the transition from the overdamped to the underdamped resonance. Results show that, by varying the VO2 conductivity by three orders of m...
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#1Tong LiH-Index: 3
#2Xiao-Qing LuoH-Index: 7
Last. Yuanli WangH-Index: 1
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#2Lei XiongH-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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Plasmonic nanostructures with large local field enhancement have been extensively investigated for sensing applications. However, the quality factor and thus the sensing figure of merit are limited due to relatively high ohmic loss. Here we propose a novel plasmonic sensor with ultrahigh figure of merit based on super-narrow Rayleigh anomaly (RA) in a mirror-backed dielectric metasurface. Simulation results show that the RA in such a metasurface can have a super-high quality factor of 16000 in t...
#1Xiao-Qing LuoH-Index: 7
#2Juan LuoH-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
view all 4 authors...
Metasurfaces incorporating graphene hold great promise for dynamic manipulation of terahertz waves. However, it remains challenging to design a broadband graphene-based terahertz metasurface with switchable functionality of half-wave plate (HWP) and quarter-wave plate (QWP). Here, we propose a graphene-metal hybrid metasurface for achieving broadband switchable HWP/QWP in the terahertz regime. Simulation results show that, by varying the Fermi energy of graphene from 0 eV to 1 eV, the function o...
#2Lei XiongH-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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We report narrow quadrupolar surface lattice resonances (SLRs) under normal incidence, and the observation, for the first time, of the band reversal effect of SLRs supported by a vertical metal-insulator-metal nanograting, which is embedded in a homogeneous dielectric environment. Simulation results show that under normal incidence, quadrupolar SLR with linewidth of 1~nm and high quality factor of 979 can be excited in the near-infrared regime, and that under oblique incidence, out-of-plane dipo...
#1Huang Wenli (GUET: Guilin University of Electronic Technology)
#2Xiao-Qing Luo (CAS: Chinese Academy of Sciences)H-Index: 7
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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We propose an ultra-broadband terahertz bandpass filter with dynamically tunable attenuation based on a graphene–metal hybrid metasurface. The metasurface unit cell is composed of two metal stripes enclosed with a graphene rectangular ring. Results show that when the metasurface is normally illuminated by a terahertz wave polarized along the metal stripes, it can act as an ultra-broadband bandpass filter over the spectral range from 1.49 THz to 4.05 THz, corresponding to a fractional bandwidth o...
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#1Shi Yunjie (Changchun University of Science and Technology)
#2Lei Xiong (CAS: Chinese Academy of Sciences)H-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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We report that using asymmetric lattice periods can enhance the quality factor of plasmonic surface lattice resonances (SLRs) in two-dimensional array of metal-insulator-metal nanopillars in asymmetric dielectric environment. Simulation results show that by adopting appropriate asymmetric lattice periods, the SLR quality factor can be enhanced by 24% compared with the scenario of symmetric periods. We find that the SLR quality factor is optimized when the resonance wavelength is closest to the R...
Source
#1Xiao-Qing LuoH-Index: 7
#2Fangrong HuH-Index: 21
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
view all 3 authors...
Dynamically switchable half-/quarter-wave plates have recently been the focus in the terahertz regime. Conventional design philosophy leads to multilayer metamaterials or narrowband metasurfaces. Here we propose a novel design philosophy and a VO2-metal hybrid metasurface for achieving broadband dynamically switchable half-/quarter-wave plate (HWP/QWP) based on the transition from the overdamped to the underdamped resonance. Results show that, by varying the VO2 conductivity by three orders of m...
#1Lei Xiong (Yunnan University)H-Index: 1
#2Hongwei Ding (Yunnan University)H-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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We propose dynamically switchable multispectral plasmon-induced transparency (PIT) with high modulation depth in a three-dimensional metamaterial standing on a flexible substrate. The proposed metamaterial is composed of a pair of metal–insulator–metal (MIM) nano-cut-wires and a pair of insulator–metal–insulator (IMI) nano-cut-wires. Results show that two PIT windows can be achieved because of the near-field coupling between the dipole supported by the IMI nano-cut-wire and two quadrupoles suppo...
1 CitationsSource
#1Xinyu Fang (Anhui Normal University)
#2Lei Xiong (CAS: Chinese Academy of Sciences)H-Index: 1
Last. Guangyuan Li (CAS: Chinese Academy of Sciences)H-Index: 16
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We propose a plasmonic platform for achieving out-of-plane quadrupolar plasmonic surface lattice resonances (SLRs) with large quality factors. The proposed platform is composed of a horizontal metal–insulator–metal (MIM) grating embedded in a homogeneous dielectric environment. Numerical results based on rigorous coupled-wave analysis show that under oblique incidences, high-Q out-of-plane quadrupolar SLRs can be excited at wavelengths of 1242 nm over a wide range of insulator widths, and the qu...
1 CitationsSource