149 citations · 334 across the 15 of their papers we have counts for
15 papers
Multi-Mode Optical Chirality Extremizations on Incident Momentum Sphere
Pengxiang Wang, Yuntian Chen, Wei Liu
We study the momentum-space evolutions for chiral optical responses of multi-mode resonators scattering plane waves of varying incident directions. It was revealed, in our previous…
Robust exceptional point of arbitrary order in coupled spinning cylinders
Hongkang Shi, Zheng Yang, Chengzhi Zhang +3
Exceptional points (EPs), i.e., non-Hermitian degeneracies at which eigenvalues and eigenvectors coalesce, can be realized by tuning the gain/loss contrast of different modes in no…
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…
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…
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…
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…
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…