An ultra-wideband metamaterial absorber is developed,which is polarized-insensitive and angular-stable.Three layers of square resistive films comprise the proposed metamaterial.The optimal values of geometric paramete...An ultra-wideband metamaterial absorber is developed,which is polarized-insensitive and angular-stable.Three layers of square resistive films comprise the proposed metamaterial.The optimal values of geometric parameters are obtained,such that the designed absorber can achieve an ultra-broadband absorption response from 4.73 to 39.04 GHz(relative bandwidth of 156.7%)for both transverse electricity and transverse magnetic waves.Moreover,impedance matching theory and an equivalent circuit model are utilized for the absorption mechanism analysis.The compatibility of equivalent circuit calculation results,together with both full-wave simulation and experimental results,demonstrates the excellent performance and applicability of the proposed metamaterial absorber.展开更多
Circulators play a significant role in radar and microwave communication systems.This paper proposes a broadband and highly efficient plasmonic circulator,which consists of spoof surface plasmon polaritons(SSPPs)waveg...Circulators play a significant role in radar and microwave communication systems.This paper proposes a broadband and highly efficient plasmonic circulator,which consists of spoof surface plasmon polaritons(SSPPs)waveguides and ferrite disks to support non-reciprocal mode coupling.The simulated performance of symmetrically designed circulator shows that it has an insertion loss of roughly 0.5 dB while the isolation and return loss is more than 12 dB in the frequency range of 6.0 GHz–10.0 GHz(relative bandwidth of 50%).Equivalent circuit model has been proposed to explain the operating mechanism of the plasmonic circulator.The equivalent circuit model,numerical simulations,and experimental results are consistent with each other,which demonstrates the good performance of the proposed plasmonic circulator.展开更多
The pseudo-magnetic field,an artificial synthetic gauge field,has attracted intense research interest in the classical wave system.The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal(PhC...The pseudo-magnetic field,an artificial synthetic gauge field,has attracted intense research interest in the classical wave system.The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal(PhC)by introducing the uniaxial linear gradient deformation.The emergence of the pseudomagnetic field leads to the quantization of Landau levels.The quantum-Hall-like edge states between adjacent Landau levels are observed in our designed experimental implementation.The combination of two reversed gradient PhCs gives rise to the spatially nonuniform pseudo-magnetic field.The propagation of the large-area edge state and the interesting phenomenon of the snake state induced by the nonuniform pseudo-magnetic field is experimentally demonstrated in a PhC heterostructure.This provides a good platform to manipulate the transport of electromagnetic waves and to design useful devices for information processing.展开更多
Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a...Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a uniaxially anisotropic substrate,where the anisotropy provides an additional freedom to tune the behaviors of graphene plasmons,and its effect can be described by a simple effective formula.In practice,the substrates of semi-infinite and finite thickness are discussed by using both the formula and full wave simulations.Particularly,the dielectric constants ε|| and ε⊥ approaching zero are intensively studied,which show different impacts on the transverse magnetic(TM) surface modes.In reality,the hexagonal boron nitride(hBN) can be chosen as the anisotropic substrate,which is also a hyperbolic material in nature.展开更多
Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are comb...Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are combined to generate topological edge states.We reveal the relationship between the edge states and the rotation parameters of PCs,and further propose a WDM to realize the application of adjustable beams.Our findings successfully reveal the channel selectivity for optical transmission and provide a flexible way to promote the development of topological photonic devices.展开更多
Many works on topological insulators have focused on periodic lattice systems,where short-and long-range order is considered.Here we construct a two-dimensional amorphous photonic crystal with short-range order and a ...Many works on topological insulators have focused on periodic lattice systems,where short-and long-range order is considered.Here we construct a two-dimensional amorphous photonic crystal with short-range order and a controllable level of long-range order and experimentally investigate the transport of topological edge states in this amorphous system.We demonstrate that topology properties remain constant with unidirectional edge state propagation,immune to specific disorder strength.The partition phenomena of edge states are also observed at the intersection of four topological channels in microwave experiments.This proposed amorphous configuration provides new opportunities to explore the relationship between short-range order and topology and may alleviate the fabrication difficulties of topological optical devices for practical applications.展开更多
Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ...Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ase-based metasurfaces lack the ability to control two spins simultaneously.In this paper,we designed a set of meta-atoms with appropriate geometric dimensions and orientation angles to achieve complete spin decoupling.Metasurfaces engineered by geometric phase and propagating phase can produce various vortex beams with distinct topological charges when illuminated by right-handed circular polarization and left-handed circular polarization.The experiments are conducted to assess the near-field and far-field efficacy of vortex beams.The experimental findings align well with the theoretical predictions.This study provides novel techniques for the arbitrary generation of high-performance vortex beams generated by metasurfaces within the microwave domain,which can be widely used in information encryption and 5G/6G wireless communication systems,facili-tating advancements in high-performance wireless encrypted communication systems.展开更多
基金Supported by the Six Talent Peaks Project in Jiangsu Province(Grant No.XYDXX-072)the National Natural Science Foundation of China(Grant Nos.61372048 and 61771226)the Natural Science Foundation of Jiangsu Province(Grant No.BK20161186).
文摘An ultra-wideband metamaterial absorber is developed,which is polarized-insensitive and angular-stable.Three layers of square resistive films comprise the proposed metamaterial.The optimal values of geometric parameters are obtained,such that the designed absorber can achieve an ultra-broadband absorption response from 4.73 to 39.04 GHz(relative bandwidth of 156.7%)for both transverse electricity and transverse magnetic waves.Moreover,impedance matching theory and an equivalent circuit model are utilized for the absorption mechanism analysis.The compatibility of equivalent circuit calculation results,together with both full-wave simulation and experimental results,demonstrates the excellent performance and applicability of the proposed metamaterial absorber.
基金Project supported by the Six-Talent-Peaks Project in Jiangsu Province of China(Grant No.XYDXX-072)the National Natural Science Foundation of China(Grant No.61372048).
文摘Circulators play a significant role in radar and microwave communication systems.This paper proposes a broadband and highly efficient plasmonic circulator,which consists of spoof surface plasmon polaritons(SSPPs)waveguides and ferrite disks to support non-reciprocal mode coupling.The simulated performance of symmetrically designed circulator shows that it has an insertion loss of roughly 0.5 dB while the isolation and return loss is more than 12 dB in the frequency range of 6.0 GHz–10.0 GHz(relative bandwidth of 50%).Equivalent circuit model has been proposed to explain the operating mechanism of the plasmonic circulator.The equivalent circuit model,numerical simulations,and experimental results are consistent with each other,which demonstrates the good performance of the proposed plasmonic circulator.
基金supported by the Graduate Innovation Program of China University of Mining and Technology (Grant No.2023WLJCRCZL273)the Fundamental Research Funds for the Central Universities (Grant No.2023ZDYQ11003)+4 种基金the China Postdoctoral Science Foundation (Grant No.2023M743784)the State Key Laboratory of Millimeter Waves (Grant No.K202407)the Basic Research Program of Xuzhou (Grant No.KC22016)the Key Academic Discipline Project of China University of Mining and Technology (Grant No.2022WLXK06)the National Natural Science Foundation of China (Grant No.12274315).
文摘The pseudo-magnetic field,an artificial synthetic gauge field,has attracted intense research interest in the classical wave system.The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal(PhC)by introducing the uniaxial linear gradient deformation.The emergence of the pseudomagnetic field leads to the quantization of Landau levels.The quantum-Hall-like edge states between adjacent Landau levels are observed in our designed experimental implementation.The combination of two reversed gradient PhCs gives rise to the spatially nonuniform pseudo-magnetic field.The propagation of the large-area edge state and the interesting phenomenon of the snake state induced by the nonuniform pseudo-magnetic field is experimentally demonstrated in a PhC heterostructure.This provides a good platform to manipulate the transport of electromagnetic waves and to design useful devices for information processing.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11604382 and 11574140)the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20160236).
文摘Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a uniaxially anisotropic substrate,where the anisotropy provides an additional freedom to tune the behaviors of graphene plasmons,and its effect can be described by a simple effective formula.In practice,the substrates of semi-infinite and finite thickness are discussed by using both the formula and full wave simulations.Particularly,the dielectric constants ε|| and ε⊥ approaching zero are intensively studied,which show different impacts on the transverse magnetic(TM) surface modes.In reality,the hexagonal boron nitride(hBN) can be chosen as the anisotropic substrate,which is also a hyperbolic material in nature.
基金National Key Research and Development Program of China(2022YFE0122300)National Natural Science Foundation of China(11811530052,12004425,1211101294,62105126)+2 种基金State Key Laboratory of Millimeter Waves(K202105,K202238)Intergovernmental Science and Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China(CB02-20)Natural Science Foundation of Jiangsu Province(BK20200630)。
文摘Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are combined to generate topological edge states.We reveal the relationship between the edge states and the rotation parameters of PCs,and further propose a WDM to realize the application of adjustable beams.Our findings successfully reveal the channel selectivity for optical transmission and provide a flexible way to promote the development of topological photonic devices.
基金supported by the Key Academic Discipline Project of China University of Mining and Technology(Grant No.2022WLXK06)the National Natural Science Foundation of China(Grant Nos.11874274,12004425,and 12274315)+3 种基金the Natural Science Foundation of Jiangsu Province(Grant No.BK20200630)the Qing Lan Projecta Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the Basic Research Program of Xuzhou(Grant No.KC22016)。
文摘Many works on topological insulators have focused on periodic lattice systems,where short-and long-range order is considered.Here we construct a two-dimensional amorphous photonic crystal with short-range order and a controllable level of long-range order and experimentally investigate the transport of topological edge states in this amorphous system.We demonstrate that topology properties remain constant with unidirectional edge state propagation,immune to specific disorder strength.The partition phenomena of edge states are also observed at the intersection of four topological channels in microwave experiments.This proposed amorphous configuration provides new opportunities to explore the relationship between short-range order and topology and may alleviate the fabrication difficulties of topological optical devices for practical applications.
基金National Key Research and Development Program of China(2024YFE107800)National Natural Science Foundation of China(62205127)+1 种基金Basic Research Program of Jiangsu(BK20231493)Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province(KJS2272).
文摘Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ase-based metasurfaces lack the ability to control two spins simultaneously.In this paper,we designed a set of meta-atoms with appropriate geometric dimensions and orientation angles to achieve complete spin decoupling.Metasurfaces engineered by geometric phase and propagating phase can produce various vortex beams with distinct topological charges when illuminated by right-handed circular polarization and left-handed circular polarization.The experiments are conducted to assess the near-field and far-field efficacy of vortex beams.The experimental findings align well with the theoretical predictions.This study provides novel techniques for the arbitrary generation of high-performance vortex beams generated by metasurfaces within the microwave domain,which can be widely used in information encryption and 5G/6G wireless communication systems,facili-tating advancements in high-performance wireless encrypted communication systems.
