377 citations · 1.6k across the 33 of their papers we have counts for
16 papers · 1 filter
Noncontact frictional force between surfaces by peristaltic permittivity modulation
Daigo Oue, Kun Ding, J. B. Pendry
In this study, we reveal noncontact frictional forces between surfaces in the presence of peristaltic permittivity modulation. Our setup comprises a conducting medium, an air gap,…
Čerenkov radiation in vacuum from a superluminal grating
Daigo Oue, Kun Ding, J. B. Pendry
Nothing can physically travel faster than light in vacuum. This is why it has been considered that there is no Čerenkov radiation (ČR) without an effective refractive index due to…
Calculating spatiotemporally modulated surfaces: a dynamical differential formalism
Daigo Oue, Kun Ding, J. B. Pendry
Electromagnetic waves in a system with a space and time dependent boundary experience both diffraction and Doppler-like frequency conversion. In order to analyse such situations, c…
Exceptional Cones in 4D Parameter Space
Qiang Wang, Kun Ding, Hui Liu +2
The notion of synthetic dimensions has expanded the realm of topological physics to four dimensional (4D) space lately. In this work, non-Hermiticity is used as a synthetic paramet…
Realization of Photonic Charge-2 Dirac Point by Engineering Super-modes in Topological Superlattices
Mengying Hu, Kun Ding, Tong Qiao +4
Quite recently a novel variety of unconventional fourfold linear band degeneracy points has been discovered in certain condensed-matter systems. Contrary to the standard 3-D Dirac…
Plasmon Localization Assisted by Conformal Symmetry
Lizhen Lu, Emanuele Galiffi, Kun Ding +3
Plasmonic systems have attracted remarkable interest due to their application to the subwavelength confinement of light and the associated enhancement of light-matter interactions.…
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…
Machine prediction of topological transitions in photonic crystals
Bei Wu, Kun Ding, C. T. Chan +1
We train artificial neural networks to distinguish the geometric phases of a set of bands in 1D photonic crystals. We find that the trained network yields remarkably accurate predi…
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…
Polarization conversion of non-specular diffraction orders from metallic nanohole arrays studied by Fourier space polarimetry
Z. L. Cao, K. Ding, L. Y. Yiu +3
We use Fourier space polarimetry to study the incident angle- and polarization-dependent rotation angle and ellipticity of different diffraction orders emerging from a two-dimensio…
Optical forces, torques and force densities calculated at a microscopic level using a self-consistent hydrodynamics method
Kun Ding, C. T. Chan
The calculation of optical force density distribution within a material is challenging at the nanoscale, where quantum and non-local effects emerge and macroscopic parameters such…
Simultaneous Realization of Coherent Perfect Absorber and Laser by Zero-Index Media with both Gain and Loss
Ping Bai, Kun Ding, Gang Wang +5
We investigate a unique type of zero-index medium with both gain and loss (ZIMGL), whose effective permittivity and permeability are purely imaginary and of opposite signs. We show…
Coalescence of spectral singularities and phase diagrams for one-dimensional PT symmetric photonic crystals
Kun Ding, Z. Q. Zhang, C. T. Chan
Non-Hermitian systems with parity-time (PT) symmetric complex potentials can exhibit a phase transition when the degree of non-Hermiticity is increased. Two eigenstates coalesce at…
The Engineering of Optical Conservative Force
Junjie Du, Chi-Hong Yuen, Kun Ding +4
Optical forces have been fruitfully applied in a broad variety of areas that not only span the traditional scientific fields such as physics, chemistry, and biology, but also in mo…
Negative Optical Torque
Jun Chen, Jack Ng, Kun Ding +3
Maxwell noted that light carries angular momentum, and as such it can exert torques on material objects. This was subsequently proved by Beth in 1936. Applications of these opto-me…
Realizing optical pulling force using chirality
Kun Ding, Jack Ng, Lei Zhou +1
We derived an analytical formula for the optical force acting on a small anisotropic chiral particle. The behavior of chiral particles is qualitatively different from achiral parti…