Polarization singularities of vectorial electromagnetic fields locate at the positions where
properties of polarization ellipses are not defined. First observed for conical diffraction in …

Spin angular momentum associated with circular polarization is a fundamental and
important aspect of photons both in classical and quantum optics. The interaction of this …

Topological complex transient electromagnetic fields give access to nontrivial light-matter
interactions and provide additional degrees of freedom for information transfer. An important …

The polarization singularity in momentum space has recently been discovered as a new
class of topological signatures of Bloch modes in photonic crystal slabs concerning the far …

We analyze scattering properties of twisted bilayer photonic crystal slabs through a high-
dimensional plane wave expansion method. The method is applicable for arbitrary twist …

We propose the generation of 3D linear light bullets propagating in free space using a single
passive nonlocal optical surface. The nonlocal nanophotonics can generate space–time …

Despite a long history of studies, acoustic waves are generally regarded as spinless scalar
waves, until recent research revealed their rich structures. Here, we report the experimental …

Chiral optical effects are generally quantified along some specific incident directions of
exciting waves (especially for extrinsic chiralities of achiral structures) or defined as direction …

A full Poincaré (FP) beam possesses all possible optical spin states in its cross section,
which constitutes an optical analog of a skyrmion. Until now FP beams have been …

Multicomponent Bose–Einstein condensates, quantum Hall systems, and chiral magnetic
materials display twists and knots in the continuous symmetries of their order parameters …