149 citations · 445 across the 19 of their papers we have counts for
19 papers
Extremize Optical Chiralities through Polarization Singularities
Weijin Chen, Qingdong Yang, Yuntian Chen +1
Chiral optical effects are generally quantified along some specific incident directions of exciting waves (especially for extrinsic chiralities of achiral structures) or defined as…
Arbitrary Polarization-Independent Backscattering or Reflection by Rotationally-Symmetric Reciprocal Structures
Weijin Chen, Qingdong Yang, Yuntian Chen +1
We study the backward scatterings of plane waves by reciprocal scatterers and reveal that -fold () rotation symmetry is sufficient to secure invariant backscattering for…
Ideal Kerker scattering by homogeneous spheres: the role of gain or loss
Qingdong Yang, Weijin Chen, Yuntian Chen +1
We reexamine a recent work [Phys. Rev. Lett. \textbf{125}, 073205 (2020)] that investigates how the optical gain or loss (characterized by isotropic complex refractive indexes) inf…
Scattering invariance for arbitrary polarizations protected by joint spatial-duality symmetries
Qingdong Yang, Weijin Chen, Yuntian Chen +1
We reveal how to exploit joint spatial-electromagnetic duality symmetries to obtain invariant scattering properties (including extinction, scattering, absorption) of self-dual scat…
Symmetry Protected Invariant Scattering Properties for Arbitrary Polarizations
Qingdong Yang, Weijin Chen, Yuntian Chen +1
Polarization independent Mie scattering of building blocks is foundational for constructions of optical systems with robust functionalities. Conventional studies for such polarizat…
Scattering and absorption invariance of nonmagnetic particles under duality transformations
Qingdong Yang, Weijin Chen, Yuntian Chen +1
We revisit the total scatterings (in terms of extinction, scattering and absorption cross sections) by arbitrary clusters of nonmagnetic particles that support optically-induced ma…
Evolution and global charge conservation for polarization singularities emerging from nonhermitian degeneracies
Weijin Chen, Qingdong Yang, Yuntian Chen +1
Core concepts in singular optics, especially the polarization singularity, have rapidly penetrated the surging fields of topological and nonhermitian photonics. For open photonic s…
Electromagnetic Duality Protected Scattering Properties of Nonmagnetic Particles
Qingdong Yang, Weijin Chen, Yuntian Chen +1
Optical properties of nonmagnetic structures that support artificial optically-induced magnetic responses have recently attracted surging interest. Here we conduct symmetry-dictate…
Global Mie Scattering
Weijin Chen, Qingdong Yang, Yuntian Chen +1
In various subdisciplines of optics and photonics, Mie theory has been serving as a fundamental language and play indispensable roles widely. Conventional studies related to Mie sc…
Ultrafast ratchet dynamics of skyrmion by defect engineering under gigahertz magnetic fields
Weijin Chen, Linjie Liu, Yue Zheng
The novel ratchet motion of magnetic skyrmions driven by microwave magnetic fields, with the motion direction and speed tunable by field parameters, provides a promising route to d…
Scattering Activities Bounded by Reciprocity and Parity Conservation
Weijin Chen, Qingdong Yang, Yuntian Chen +1
Scattering activities are generally manifest through different optical responses of scattering bodies to circularly polarized light of opposite handedness. Similar to the ubiquitou…
Gauge-field description of Sagnac frequency shift and mode hybridization in a rotating cavity
Hongkang Shi, Zhongfei Xiong, Weijin Chen +3
Active optical systems can give rise to intriguing phenomena and applications that are not available in conventional passive systems. Structural rotation has been widely employed t…
Line Singularities and Hopf Indices of Electromagnetic Multipoles
Weijin Chen, Yuntian Chen, Wei Liu
Electromagnetic multipoles can be continuously mapped to tangent vectors on the momentum sphere, the topology of which guarantees the existence of isolated singularities. For pure…
Singularities and Poincaré Indexes of Electromagnetic Multipoles
Weijin Chen, Yuntian Chen, Wei Liu
Electromagnetic multipoles have been broadly adopted as a fundamental language throughout photonics, of which general features such as radiation patterns and polarization distribut…
Flat band localization due to self-trapped orbital
Zhen Ma, Wei-Jin Chen, Yuntian Chen +2
We discover a new wave localization mechanism in a periodic system without any disorder, which can produce a novel type of perfect flat band and is distinct from the known localiza…
Skyrmion ratchet effect driven by a biharmonic force
Weijin Chen, Linjie Liu, Ye Ji +1
Based on micromagnetic simulation and analysis of Thiele's equation, in this work we demonstrate that ratchet motion of skyrmion can be induced by a biharmonic in-plane magnetic fi…
Multipolar Conversion Induced Subwavelength High-Q Supermodes with Unidirectional Radiations
Weijin Chen, Yuntian Chen, Wei Liu
The two-mode coupling model with energy splitting and formation of supermodes with different life times has been pervasive in almost every discipline of physics. We revisit this fu…
Generalized coupled mode formalism in reciprocal waveguides with gain/loss, anisotropy or bianisotropy
Weijin Chen, Zhongfei Xiong, Jing Xu +1
In anisotropic or bianisotropic waveguides, the standard coupled mode theory fails due to the broken link between the forward and backward propagating modes, which together form th…
Classification of symmetry properties of waveguide modes in presence of gain/losses, anisotropy/bianisotropy, or continuous/discrete rotational symmetry
Zhongfei Xiong, Weijin Chen, Peng Wang +1
We study the symmetric properties of waveguide modes in presence of gain/losses, anisotropy/bianisotropy, or continuous/discrete rotational symmetry. We provide a comprehensive app…