637 citations · 3.8k across the 34 of their papers we have counts for
30 papers · 1 filter
Topological temporal boundary states in a non-Hermitian spatial crystal
Mingwei Li, Jianwei Liu, Xulong Wang +3
Periodic modulation of the material index in time opens momentum gaps. Such systems are regarded as the temporal analogue of common spatial crystals, wherein the bandgaps open in t…
High-efficiency grating couplers for pixel-level flat-top beam generation
Zhong-Tao Tian, Ze-Peng Zhuang, Zhi-Bin Fan +2
We demonstrate a kind of grating coupler that generates high quality flat-top beam with a small beamwidth from photonic integrated circuits into free-space. The grating coupler is…
Topological photonic crystals: physics, designs and applications
Guo-Jing Tang, Xin-Tao He, Fu-Long Shi +3
The recent research of topological photonics has not only proposed and realized novel topological phenomena such as one-way broadband propagation and robust transport of light, but…
Second Chern crystals in four-dimensional synthetic translation space with inherently nontrivial topology
Xiao-Dong Chen, Fu-Long Shi, Jian-Wei Liu +4
Topological states, first known as quantum Hall effect or Chern insulating crystal, have been generalized to many classical wave systems where potential applications such as robust…
Ideal Nodal Rings of One-Dimensional Photonic Crystals in the Visible Region
Wei-Min Deng, Ze-Min Chen, Meng-Yu Li +4
Three-dimensional (3D) artificial metacrystals host rich topological phases, such as Weyl points, nodal rings and 3D photonic topological insulators. These topological states enabl…
Frequency-dependent topological phases and photonic detouring in valley photonic crystals
Guo-Jing Tang, Xiao-Dong Chen, Fu-Long Shi +3
Here, the frequency degree of freedom is introduced into valley photonic crystals with dual band gaps. Based on the high-order plane wave expansion model, we derive an effective Ha…
Transmissive Metagrating for Arbitrary Wavefront Shaping Over the Full Visible Spectrum
Zi-Lan Deng, Xuan Ye, Hao-Yang Qiu +10
Metagratings have been shown to form an agile and efficient platform for extreme wavefront manipulation, going beyond the limitations of gradient metasurfaces. Previous approaches…
Realization of complex conjugate media using non-PT-symmetric photonic crystals
Xiaohan Cui, Kun Ding, Jianwen Dong +1
While parity-time (PT)-symmetric systems can exhibit real spectra in the exact PT-symmetry regime, the PT-symmetry is actually not a necessary condition for the real spectra. Here…
Exceptional points and their coalescence of PT-symmetric interface states in photonic crystals
Xiaohan Cui, Kun Ding, Jian-Wen Dong +1
The existence of surface electromagnetic waves in the dielectric-metal interface is due to the sign change of real parts of permittivity across the interface. In this work, we demo…
Layered Photonic Topological Insulators
Xiao-Dong Chen, Jian-Wen Dong
The recent realization of photonic topological insulators has brought the discovery of fundamentally new states of light and revolutionary applications such as non-reciprocal devic…
A Silicon-on-Insulator Slab for Topological Valley Transport
Xin-Tao He, En-Tao Liang, Jia-Jun Yuan +4
Silicon-on-insulator (SOI) enables for capability improvement of modern information processing systems by replacing some of their electrical counterparts. With the miniaturization…
Tunable light flow control in valley photonic crystal waveguide
Xiao-Dong Chen, Fu-Long Shi, Huan Liu +5
The exploration of binary valley degree of freedom in topological photonic systems has inspired many intriguing optical phenomena such as photonic Hall effect, robust delay lines,…
Valley controlled propagation of pseudospin states in bulk metacrystal waveguides
Xiao-Dong Chen, Wei-Min Deng, Jin-Cheng Lu +1
Light manipulations such as spin-direction locking propagation, robust transport, quantum teleportation and reconfigurable electromagnetic pathways have been investigated at the bo…
Edge states in self-complementary checkerboard photonic crystals: Zak phase, surface impedance and experimental verification
Xiao-Dong Chen, Ding Zhao, Xiao-Sheng Zhu +5
Edge states of photonic crystals have attracted much attention for the potential applications such as high transmission waveguide bends, spin dependent splitters and one-way photon…
Transverse angular momentum in topological photonic crystals
Wei-Min Deng, Xiao-Dong Chen, Fu-Li Zhao +1
Engineering local angular momentum of structured light fields in real space enables unprecedented applications in many fields, in particular for the realization of unidirectional r…
Silicon nitride metalenses for unpolarized high-NA visible imaging
Zhi-Bin Fan, Zeng-Kai Shao, Ming-Yuan Xie +6
As one of nanoscale planar structures, metasurface has shown excellent superiorities on manipulating light intensity, phase and/or polarization with specially designed nanoposts pa…
Realization of Zero-Refractive-Index Lens with Ultralow Spherical Aberration
Xin-Tao He, Zhi-Zhen Huang, Ming-Li Chang +5
Optical complex materials offer unprecedented opportunity to engineer fundamental band dispersion which enables novel optoelectronic functionality and devices. Exploration of photo…
Valley-contrasting orbital angular momentum in photonic valley crystals
Xiaodong Chen, Min Chen, Jianwen Dong
Valley, as a degree of freedom, has been exploited to realize valley-selective Hall transport and circular dichroism in two-dimensional layered materials. On the other hand, orbita…
Valley-protected backscattering suppression in silicon photonic graphene
Xiao-Dong Chen, Jian-Wen Dong
In this paper, we study valley degree of freedom in all dielectric silicon photonic graphene. Photonic band gap opening physics under inversion symmetry breaking is revisited by th…
Topological Invariants in Point Group Symmetric Photonic Topological Insulators
Xiao-Dong Chen, Zi-Lan Deng, Wen-Jie Chen +2
We proposed a group-theory method to calculate topological invariant in bi-isotropic photonic crystals invariant under crystallographic point group symmetries. Spin Chern number ha…
Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
Wen-Jie Chen, Shao-Ji Jiang, Xiao-Dong Chen +2
Achieving robust transport has attracted much attention in both electronic and photonic systems. Time-reversal invariant photonic crystal can be employed to realize backscattering-…
Lasing oscillation condition and group delay control in gain-assisted plasmon-induced transparency
Zi-Lan Deng, Jian-Wen Dong, He-Zhou Wang +2
A gain-assisted plasmonic waveguide with two detuned resonators is investigated in the plasmon-induced transparency window. Phase map is employed to study power transmittance and g…
Anisotropy-induced Fano resonance
Cheng-Wei Qiu, Andrey Novitsky, Lei Gao +2
An optical Fano resonance, which is caused by birefringence control rather than frequency selection, is discovered. Such birefringence-induced Fano resonance comes with fast-switch…
Observation of backscattering-immune chiral electromagnetic modes without time reversal breaking
Wen-Jie Chen, Jian-Wen Dong, Zhi Hong Hang +3
A strategy is proposed to realize robust transport in time reversal invariant photonic system. Using numerical simulation and microwave experiment, we demonstrate that a chiral gui…